Question

An electric heater draws a current of 10a from a 220v supply. What is the cost pf using the heater 5 hours per day for 30 days if the cost of 1 unit is rs. 2.50

Answer 1

P=VI
E=P/t=VI/T
=220×10/(5×1000)=22/50(1000 watt ke kilowatt banane ke liye)
total units =22×30/50=66/5=13.2 equivalent to 13 kw/hr=13 units
1kw/hr=1 units
cost=13×2.50
=32.50 rs.