GCSE Physics Unit 2 Revision (4)

Circuits - The Basics

• Current - is the flow of electrons around a circuit. Current will only flow through a component if these is a voltage across that component. The unit for current is Amps (A).
• Voltage - the driving force that pushes current round. Like a sort of electrical pressure. The unit for voltage is Volts (V).
• Resistance - anything which slows down the flow round a circuit. The unit for resistance is Ohms.
• The voltage tries to push the current around the circuit, and the resistance opposes this. If you increase the voltage, then more current will flow. If you increase the resistance, then less current will flow (or more voltage will be needed to keep…