Question

An electric heater is rated 1500 W. How much energy does it use in 10 hours?

Answer 1

Step 1: Given data

1. The power of the electric heater is, $P=1500watt.$
2. Time of use, $t=10hours=36000seconds.$

Step 2: Power

1. Power is the energy consumed by a heater in a unit of time.
2. Power is defined by the form, $P=\frac{E}{t}$, where E is the energy and t is the total time.

Step 3: Calculation of heat energy

Now from the formulae, $P=\frac{E}{t}$.

$$\begin{gathered} E=P\times t=1500\times 36000 \\ orE=54\times {10}^{6}joule \end{gathered}$$

The energy used by the heater in 10 hours is $54\times {10}^{6}joule.$