The temperature of a room in winter is kept constant at by using a heater

PHYSICS · Subjective · GCSE · Physics · Energy · Energy

Problem

The temperature of a room in winter is kept constant at

24\text{ }^{\circ}\text{C}

by using a heater. The room is separated from the outside, where the temperature is

-5.0\text{ }^{\circ}\text{C}

, by a wall of area

12\text{ m}^2

and thickness

0.20\text{ m}

. The material of the wall has a thermal conductivity of

0.15\text{ W m}^{-1}\text{ K}^{-1}

. Estimate the power of the heater.