Question

A lamp consumes $1000J$ of electrical energy in $10s$. What is its power?

Answer 1

Step 1: Given data.

Work done on the lamp, $\mathrm{W}=1000J$

Time, $\mathrm{t}=10s$

Step 2: Calculate the power.

We know, power is,

$$\begin{gathered} \mathrm{P}=\frac{\mathrm{W}}{\mathrm{t}} \\ \mathrm{P}=\frac{1000J}{10s} \\ \mathrm{P}=100\mathrm{watt} \end{gathered}$$

Hence, the power of the lamp is $100\mathrm{watt}$.