Electrical Energy Flashcards

All 5 cards in this deck

What is the equation linking energy transferred, charge flow and potential difference?

$\text{energy transferred} = \text{charge flow} \times \text{potential difference}$

$E = QV$

What happens, in terms of work, when charge flows in a circuit?

Work is done, so energy is transferred from the power supply to the circuit components.

What are the units of energy transferred, charge flow and potential difference in $E = QV$?

Energy in joules (J), charge in coulombs (C), potential difference in volts (V).

In an electric kettle, energy is transferred from which store to which store?

From the ac mains, by electrical work, to the thermal energy store of the water.

What are the steps to find the energy transferred from the charge flow and the potential difference?

e.g. 20 C of charge flows through a 12 V supply

1. Use $E = QV$
2. Substitute: $E = 20 \times 12$
3. $E = 240$ J