Question

Define power. A lamp consumes 600 J of electrical energy in 30 seconds. Calculate its power.

Answer 1

1. Power may be defined as the rate of doing work or the rate of energy transferred.
2. $Power=\frac{Energysupplied\left(E\right)}{time\left(t\right)}$

Step 1: Given the electrical energy consumed by the electrical lamp (E)= 600 J
Time for which lamp is operated (t)=30 seconds
Let P is the electrical power consumed by the bulb.
Substituting the value of E and t we get-
$$\begin{gathered} P=\frac{600J}{30s} \\ orP=20watt \end{gathered}$$

Hence the power of the electrical lamp is 20 watt.