Physics Lecture: Power and Energy

Vocabulary flashcards covering the key definitions, units, equations, and graphical interpretations related to power and energy from the lecture notes.

Power

Defined as the rate at which work is done.

Instantaneous power

The power given by $P = F \times v$ when the rate of doing work is not constant.

1 Horse power

Equal to $746\,\text{watt}$.

Commercial unit of energy

Kilo watt hour ($\text{kWh}$).

Unit of power in S.I. system

Watt.

Area under P-t graph

The area under the power-time ($P-t$) graph gives work done.

Efficiency

The ratio of output power to the input power.