Electricity is charged at Rs per kWh

PHYSICS · Single correct · CBSE · Physics · Electricity · Electricity

Problem

Electricity is charged at Rs

5

per kWh. A student wishes to use an electric heater for

3\,\text{h}

each day but wants to keep the monthly (30-day) cost below Rs

450

. What is the maximum power rating the heater can have? (a)

0.5\,\text{kW}

(b)

1.5\,\text{kW}

(c)

1\,\text{kW}

(d)

2\,\text{kW}