Question

Find the cost of running the heater if 1KWh costs Rupees 6.50

Answer 1

Voltage, V = 220 V

Now, current is, I = P/V = 4000/220 = 18.18 A

Resistance is, R = V2/P = 2202/4000 = 12.1 Ω

Energy consumed in 2 h is = 4000 × 2/1000 = 2 kWh

So, cost of energy consumed is = 4.60 × 1.5 = Rs 6.9

2)P=50W V=220V TIME =20 min=20/60hrs

E=P X T

=50/1000 X 20/60

=0.016KWH