Power and Energy (Grade 11 NSC Matric Physical Sciences): Flashcards

Rate at which electrical energy is converted in a circuit

$P = I \times V$

$P = I^2R$

$P = \frac{V^2}{R}$

$E = P \times t$

Power is rate of energy conversion; energy is total amount

Same current flows through all components

Joules (J)

Using 1 kW of power for 1 hour

Energy (kWh) × Price per kWh