Current Flow and Energy Transfer

This page explains the flow of current in circuits and the associated energy transfers, which is crucial for understanding why current is conserved at a junction in a circuit GCSE Physics.

Key points about current flow:

• Electrons carry energy from the cell around the circuit
• Energy is transferred to components like lamps
• In lamps, electrical energy is converted to light and thermal energy
• Electrons return to the positive end of the cell with less energy

Example: In a lamp, the electrical energy carried by electrons is converted into light and heat energy.

The page also revisits the concept of conventional current flow:

• Electric current flows from the negative to the positive end of the cell
• Conventional current is drawn in the opposite direction

Highlight: Understanding the direction of electron flow versus conventional current is crucial for GCSE Physics students.

The page concludes with an explanation of a series circuit:

• It has no branches
• Current can only flow in one path around the circuit

This information helps students understand series and parallel circuits GCSE concepts and prepares them for questions on current in parallel circuit and series circuit behavior.

Current and Circuit Basics

This page introduces the concept of electric current and its behavior in circuits, focusing on series and parallel circuits GCSE Physics concepts.

An electric current is defined as the flow of electric charge around a circuit. It is measured in amperes (A) using an ammeter. In a circuit, current is never used up, and in a series circuit, it remains constant throughout.

Definition: Electric current is the flow of electric charge around a circuit, measured in amperes (A).

The page also introduces the concept of conventional current, which is opposite to the actual flow of electrons.

Highlight: Scientists draw conventional current flowing from the positive to the negative terminal, opposite to the actual electron flow.

For parallel circuits GCSE, the page explains that:

• Parallel circuits contain branches
• Current is divided among these branches
• The total current leaving the cell equals the sum of currents in all branches

Example: In a parallel circuit with three branches showing currents of 0.1A, 0.2A, and 0.3A, the total current leaving the cell would be 0.6A.

This information is crucial for understanding how current flows in parallel circuits GCSE physics.