An electric motor rated 1100 W is connected to 220 V mains. Find : (i) The current drawn from the mains,…
An electric motor rated 1100 W is connected to 220 V mains. Find :
(i) The current drawn from the mains,
(ii) Electric energy consumed if the motor is used for 5 hours daily for 6 days.
(iii) Total cost of energy consumed if the rate of one unit is ₹ 5.
OR
Study the following circuit and find :
(i) Effective resistance of the circuit
(ii) Current drawn from the battery
(iii) Potential difference across the 5 Ω resistor
Solution
Power (P) = 1100 W, V = 220 V
(i) Current drawn = I = P/V
= 1100 W / 220 V = 5 A
(ii) E = P × t
= 1100 W × 5 h × 6 = 33000 Wh
(iii) Cost of one commercial unit = ₹5
Energy consumed = 33 kWh = 33 unit = 118.8 × 106 J
Cost of 33 unit = 33 × 5 = ₹165
