Question

If a heater of resistance $100\Omega$ draws a current of $5A$ for $1hour$, then the energy consumed by the heater is:

• A. $3600kJ$
• B. $9000kJ$
• C. $2500kJ$
• D. $1800kJ$

Answer 1

The correct option is B $9000kJ$

Given:
Resistance $\left(R\right)=100\Omega$
Current $\left(I\right)=5A$
Time $\left(t\right)=1hour=3600s$

According to joule's law of heating, heat generated is given by: $H=I^{2}Rt=(5A{)}^2\times 100\Omega \times 3600s$
$=9000000J=9000KJ$
Therefore, the energy consumed by the heater is $9000KJ$.