Question

one 60 watt bulb used for 5 hours daily. One 100 watt bulb used for 3 hours daily one 1kw electric heater used for 2 hour daily also calculate the monthly bill at the rate of Rs.2.50 per unit

Answer 1

bulb(1) =60/1000=0.06kw

P=0.06×5/100=3/10=0.3kwh

bulb(2)=100/1000=0.1kw

P=0.1×3/10=0.3kwh

Heater=1kw×2= 2kwh

Total power=0.3+0.3+2=2.6kwh

Bill= 30×2.5×2.6= 195 rupees