Revise and learn about electrical circuits, charge, current, power and resistance with this BBC Bitesize Combined Science AQA Synergy study guide.

Use Ohms law to relate resistance, current and voltage. In National 5 Physics calculate the resistance for combinations of resistors in series and parallel.

A tip for quick calculation – when all resistors are the same value, their equivalent resistance is their value divided by the number in of parallel resistors. Break the circuit down into small pairs ...