Electric Power (VCE SSCE Physics): Flashcards

Rate at which energy is transformed or work is done

Watt (W), where $1 \text{ W} = 1 \text{ J} \cdot \text{s}^{-1}$

$P = \frac{E}{t}$ (power = energy / time)

$P = VI$ (power = voltage × current)

$P = I^2R$

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

Power increases with the square of current

Parallel circuits use more power (same components & voltage)

Independent operation, full voltage, reliability

Parallel has lower equivalent resistance than series