AS AQA Phys Unit 1- Conservation of Energy & Charge in Circuits


Conserving charge

As charge flows through a circuit, it doesn't get used up or lost. This means that whatever charge flows into a junction will flow out again. As current is the rate of charge, whatever current flows into a junction is the same as the current flowing out. Kirchoff's first law states:

The total current entering a junction = the total current leaving it

Conserving energy

As well as charge being conserved, energy is also conserved. In electrical circuits, energy is transferred around the circuit. Energy transferred to a charge is emf, and energy transferred from a charge is potential difference. In a closed…


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