Question

b) An electric heater draws a current of 12A from a 220V supply. What is the cost of using the heater for 4 hours everyday for 30 days if he cost of 1 unit is Rs 5.50?

Answer 1

Answer:

Rs 157.74

Explanation:

I = 12 A

V = 220 V

P = ?

P= IV

P = 12*220

P= 2640watt

H= pt

H= 2.64kw * 4hrs= 9.56kwh

9.56kwh*30=28.68 kWh

1kwh(unit) = RS 5.50

28.68Kwh=157.74 Rs