Question

Define the physical quality whose unit is wattA radio set 60 watt runs 50 hours how many units (KWh) of electrical energy are consumed

Answer 1

$$\begin{gathered} \mathbf{Power}\mathbf{:} \\ \mathrm{Power}\mathrm{is}\mathrm{the}\mathrm{rate}\mathrm{at}\mathrm{which}\mathrm{work}\mathrm{is}\mathrm{done}. \\ \mathrm{Watt}\mathrm{is}\mathrm{the}\mathrm{unit}\mathrm{of}\mathrm{Power} \\ \mathrm{Electrical}\mathrm{energy}\mathrm{consumed}: \\ \mathrm{E}=\mathrm{P}\mathrm{t} \\ =60\times 50 \\ =3000\mathrm{Wh} \\ =3\mathrm{kWh} \\ =3\mathrm{units} \end{gathered}$$