# Potential divider circuits

I can calculate p.d. across one of two components in a series circuit with a battery.

# Potential divider circuits

I can calculate p.d. across one of two components in a series circuit with a battery.

## Lesson details

### Key learning points

- The p.d. across a component in an electric circuit measures the size of push that is moving current through it.
- The p.d. across each component in a series circuit adds up to the p.d. across the battery.
- The current is the same through every component in a series circuit.
- The larger the total resistance of a series circuit, the smaller the current through it.
- In a series circuit, the share of p.d. across each component is proportional to its resistance.

### Common misconception

A battery pushes a constant current around a circuit.

Provide opportunity for pupils to measure p.d. across a power supply when the resistance of a circuit it is connected to is altered.

### Keywords

Series circuit - an electrical circuit with a single loop

Potential difference (p.d.) - a measure of the push an electric field gives to charges

Resistance - a property of a material that opposes the flow of current

Potential divider - a series circuit that divides the p.d. across a power supply into two or more smaller voltages

### Equipment

variable resistor, lamp, power supply, two voltmeters, electrical leads

### Content guidance

- Risk assessment required - equipment

### Supervision

Adult supervision required

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Video

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