Pass Check: Electricity
Current, potential difference and resistance are linked by V = I x R in circuits.
Current
The rate of flow of electric charge, measured in amperes (A).
Potential difference
The energy transferred per unit charge between two points in a circuit, measured in volts (V).
Resistance
A measure of how difficult it is for current to flow through a component, measured in ohms (Ω).
Series circuit
A circuit where components are connected in a single loop, so the same current flows through each one.
Quick check
Mixed quiz
1. What is the unit of electric current?
2. State what static electricity is caused by.
3. State what an LDR (light-dependent resistor) does.
4. What is the unit of resistance?
5. State the function of a fuse in a plug.
6. A kettle transfers 460,000 J of energy in 200 seconds. Calculate its power.
7. Calculate the power of an appliance that draws 5 A from a 230 V mains supply.
8. Explain how a thermistor's resistance changes with temperature.