What you'll learn
How electric circuits work.
Circuits
- Current, voltage and resistance; Ohm's law (V = IR).
- Series (same current) and parallel (same voltage) circuits.
- Charge (Q = It) and power (P = VI).
- Mains electricity and wire colours.
Exam tips
- Rearrange V = IR carefully.
- State the rule for current/voltage in series vs parallel.
Common mistakes
- Swapping the series/parallel rules.
- Unit errors with power and charge.