Elektrina je všade okolo nás - v telefóne, počítači, svetlách,... Show more
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Updated Mar 16, 2026
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Základy Elektrického Prúdu a Obvodov
1 / 8
Základné pojmy elektrickej energie
Predstav si elektrický prúd ako rieku, kde sa elektróny pohybujú jedným smerom cez kovový drôt. Je to vlastne usmernený pohyb elektricky nabitých častíc, najčastejšie elektrónov.
Elektrický obvod je ako uzavretá cesta - ak nie je úplne prepojená, prúd nemôže pretekať. Základné súčiastky poznáš už teraz: zdroj (batéria), spotrebič (žiarovka), vodiče (drôty) a spínač.
Tip: Elektróny sa pohybujú od mínus k plus, ale dohodnutý smer prúdu je opačný - od plus k mínus!
Vodiče, izolanty a podmienky prúdenia
Aby prúd mohol pretekať, potrebuješ tri veci: vodič (materiál s voľnými elektrónmi), elektrické napätie (silu, ktorá tlačí elektróny) a uzavretý obvod (nepretržitú cestu).
Vodiče ako meď, hliník či striebro majú voľné elektróny a výborně vedú prúd. Izolanty ako plast, guma, drevo či sklo prúd nevedú - preto sa používajú na ochranu.
Zapamätaj si základné jednotky: prúd sa meria v ampéroch (A), napätie vo voltoch (V) a odpor v ohmoch (Ω). Tieto jednotky budeš potrebovať pri výpočtoch.
Bezpečnosť: Nikdy sa nedotýkaj zásuvky mokrými rukami - voda je vodič a prúd môže prejsť tvojím telom!
Sériové zapojenie spotrebičov
Pri sériovom zapojení sú spotrebiče zaradené za sebou ako vagóny vo vlaku. Prúd prechádza cez všetky postupne, takže má v celom obvode rovnakú hodnotu.
Problém je, že napätie sa rozdelí medzi všetky spotrebiče - každý dostane len časť. Ešte horšie je, že ak jeden spotrebič prestane fungovať, preruší sa celý obvod.
Klasickým príkladom sú staré vianočné svetielka. Ak jedna žiarovka zhasla, prestali svietiť všetky. Preto sa dnes používajú moderné LED svetielka s paralelným zapojením.
Pamätka: Sériovo = za sebou, jeden prúd, rozdelené napätie, jeden pokazí všetko.
Paralelné zapojenie spotrebičov
Paralelné zapojenie je ako niekoľko ciest vedúcich do rovnakého cieľa. Každý spotrebič má svoju vlastnú cestu k zdroju, takže ak jeden prestane fungovať, ostatné pokračujú v práci.
Pri paralelnom zapojení má každý spotrebič rovnaké napätie ako zdroj, ale prúd sa rozdelí podľa potrieb jednotlivých zariadení. Každé si "vezme" toľko prúdu, koľko potrebuje.
Takto sú zapojené všetky svetlá a zásuvky v tvojom dome. Keď vypneš svetlo v kuchyni, televízor v obývačke stále funguje. Inteligentné, nie?
Prakticky: Paralelne = vedľa seba, rozdelený prúd, rovnaké napätie, nezávislosť.
Praktické príklady a aplikácie
Baterka je perfektný príklad jednoduchého obvodu. Batérie sú zdroj, LED je spotrebič, tlačidlo je spínač a kovové kontakty sú vodiče. Keď stlačíš tlačidlo, obvod sa uzavrie a LED svieti.
V domácnosti nájdeš oba typy zapojenia. Svetlá v rôznych miestnostiach sú zapojené paralelne - preto môžeš vypnúť jedno a ostatné fungujú. Niektoré dekoračné svetlá môžu byť zapojené sériovo.
Moderná elektronika využíva kombinácie oboch zapojení podľa potreby. Procesor v tvojom telefóne obsahuje miliardy malých obvodov, ktoré spracovávajú informácie.
Zvedavosť: V tvojom telefóne je viac tranzistorov ako hviezd v galaxii!
Bezpečnosť a zhrnutie
Elektrina je užitočná, ale môže byť nebezpečná. Nikdy nevkladaj kovové predmety do zásuvky a vždy pracuj s elektrickými zariadeniami opatrne. Mokré ruky a elektrina sa absolútne neznášajú!
Hlavné body na zapamätanie: elektrický prúd je pohyb elektrónov, obvod musí byť uzavretý, vodiče vedú prúd (kovy), izolanty nie (plast, guma). Sériové zapojenie = za sebou, paralelné = vedľa seba.
Jednotky si zapamätaj ako A-V-O: Ampér pre prúd, Volt pre napätie, Ohm pre odpor. S týmito základmi zvládneš akúkoľvek úlohu z elektrotechniky.
Na skúšku: Dokážeš vysvetliť, prečo svetlá doma nezhásnu všetky, keď vypneš jedno?
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Most popular content in Fyzika
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Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
Základy Elektrického Prúdu a Obvodov
Elektrina je všade okolo nás - v telefóne, počítači, svetlách, proste vo všetkom, čo nám uľahčuje život! Dnes si vysvetlíme, ako funguje elektrický prúd a elektrický obvod, aby si rozumel/a základom elektrotechniky.
Základné pojmy elektrickej energie
Predstav si elektrický prúd ako rieku, kde sa elektróny pohybujú jedným smerom cez kovový drôt. Je to vlastne usmernený pohyb elektricky nabitých častíc, najčastejšie elektrónov.
Elektrický obvod je ako uzavretá cesta - ak nie je úplne prepojená, prúd nemôže pretekať. Základné súčiastky poznáš už teraz: zdroj (batéria), spotrebič (žiarovka), vodiče (drôty) a spínač.
Tip: Elektróny sa pohybujú od mínus k plus, ale dohodnutý smer prúdu je opačný - od plus k mínus!
Sign up to see the contentIt's free!
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Vodiče, izolanty a podmienky prúdenia
Aby prúd mohol pretekať, potrebuješ tri veci: vodič (materiál s voľnými elektrónmi), elektrické napätie (silu, ktorá tlačí elektróny) a uzavretý obvod (nepretržitú cestu).
Vodiče ako meď, hliník či striebro majú voľné elektróny a výborně vedú prúd. Izolanty ako plast, guma, drevo či sklo prúd nevedú - preto sa používajú na ochranu.
Zapamätaj si základné jednotky: prúd sa meria v ampéroch (A), napätie vo voltoch (V) a odpor v ohmoch (Ω). Tieto jednotky budeš potrebovať pri výpočtoch.
Bezpečnosť: Nikdy sa nedotýkaj zásuvky mokrými rukami - voda je vodič a prúd môže prejsť tvojím telom!
Sign up to see the contentIt's free!
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Improve your grades
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Sériové zapojenie spotrebičov
Pri sériovom zapojení sú spotrebiče zaradené za sebou ako vagóny vo vlaku. Prúd prechádza cez všetky postupne, takže má v celom obvode rovnakú hodnotu.
Problém je, že napätie sa rozdelí medzi všetky spotrebiče - každý dostane len časť. Ešte horšie je, že ak jeden spotrebič prestane fungovať, preruší sa celý obvod.
Klasickým príkladom sú staré vianočné svetielka. Ak jedna žiarovka zhasla, prestali svietiť všetky. Preto sa dnes používajú moderné LED svetielka s paralelným zapojením.
Pamätka: Sériovo = za sebou, jeden prúd, rozdelené napätie, jeden pokazí všetko.
Sign up to see the contentIt's free!
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Improve your grades
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Paralelné zapojenie spotrebičov
Paralelné zapojenie je ako niekoľko ciest vedúcich do rovnakého cieľa. Každý spotrebič má svoju vlastnú cestu k zdroju, takže ak jeden prestane fungovať, ostatné pokračujú v práci.
Pri paralelnom zapojení má každý spotrebič rovnaké napätie ako zdroj, ale prúd sa rozdelí podľa potrieb jednotlivých zariadení. Každé si "vezme" toľko prúdu, koľko potrebuje.
Takto sú zapojené všetky svetlá a zásuvky v tvojom dome. Keď vypneš svetlo v kuchyni, televízor v obývačke stále funguje. Inteligentné, nie?
Prakticky: Paralelne = vedľa seba, rozdelený prúd, rovnaké napätie, nezávislosť.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Praktické príklady a aplikácie
Baterka je perfektný príklad jednoduchého obvodu. Batérie sú zdroj, LED je spotrebič, tlačidlo je spínač a kovové kontakty sú vodiče. Keď stlačíš tlačidlo, obvod sa uzavrie a LED svieti.
V domácnosti nájdeš oba typy zapojenia. Svetlá v rôznych miestnostiach sú zapojené paralelne - preto môžeš vypnúť jedno a ostatné fungujú. Niektoré dekoračné svetlá môžu byť zapojené sériovo.
Moderná elektronika využíva kombinácie oboch zapojení podľa potreby. Procesor v tvojom telefóne obsahuje miliardy malých obvodov, ktoré spracovávajú informácie.
Zvedavosť: V tvojom telefóne je viac tranzistorov ako hviezd v galaxii!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Bezpečnosť a zhrnutie
Elektrina je užitočná, ale môže byť nebezpečná. Nikdy nevkladaj kovové predmety do zásuvky a vždy pracuj s elektrickými zariadeniami opatrne. Mokré ruky a elektrina sa absolútne neznášajú!
Hlavné body na zapamätanie: elektrický prúd je pohyb elektrónov, obvod musí byť uzavretý, vodiče vedú prúd (kovy), izolanty nie (plast, guma). Sériové zapojenie = za sebou, paralelné = vedľa seba.
Jednotky si zapamätaj ako A-V-O: Ampér pre prúd, Volt pre napätie, Ohm pre odpor. S týmito základmi zvládneš akúkoľvek úlohu z elektrotechniky.
Na skúšku: Dokážeš vysvetliť, prečo svetlá doma nezhásnu všetky, keď vypneš jedno?
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user