Question

an electric boiler draws 12A at 115V for a period of 6 hours. If the electrical energy costs 30 paisa per kWh then cost of boiler operation in Rs. is​
1. 2.84
2. 3.87
3. 4.37
4. 1.37

Answer 1

Answer:

P=VI

= 220*10

= 2200

E=P*T

=2200*5

= 11 KWH

11*30 = 330

330* 2.50= RS.825

Explanation:

Answer 2

V = 115

A = 12

T = 6 hr

COST PER KWH = 0.30 ₹

Explanation:

GIVAN THAT , (Formula, W = V × I)

W = 115×12 = 1380 watt

Kw = 1380/1000 = 1.38 Kw

(formula, kwh = Kw × T)

Kwh = 1.38 × 6 = 8.28 Kwh

cost per ₹ kwh × cost

8.28 × 0.30 = 2.484 ₹ (Ans)