A room heater is required to deliver of power when connected to a mains supply

PHYSICS · Subjective · A Level · Physics · Electricity · Electricity

Problem

A room heater is required to deliver

500\,\text{W}

of power when connected to a

220\,\text{V}

mains supply. (i) Calculate the resistance of the heating coil. (ii) The coil is to be made from nichrome wire of resistivity

1.1\times10^{-6}\,\Omega\,\text{m}

and cross-sectional area

0.40\,\text{mm}^2

. Determine the length of wire needed. (iii) Compute the heat produced when the heater operates for

2\,\text{min}