Question

calculate the monthey bill for a heater of resistance 20 ohm. Which used on 240 volt mains, such that it's daily use is for 2 hrs . the cost of electric energy is 4.30 per kWh​

Answer 1

Answer:

743.04

Explanation:

the resistance of heater (r)= 20 ohm.

v=240 volt.

then power (p) = v²/r = 240×240/20 =2880 watt

if this electric heater used for 2 hours per day..

then consumed power =(2880×2)=5760 watt.

in a month total wattage = 5760×30

= 172800 watt.

= 172.8 unit.

if per unit cost 4.30 rupees.

then the electric bill will be =(172.8×4.30)=743.04 rupees.