Question

A geyser has a rating 2 kVA, 240 V. (a) what is the electrical energy consumed by it in (i) kWh and (ii) joule if it is used for 90 mins. (b) if the cost of electricity is rupees 4.50 per commercial unit find the cost.​

Answer 1

See below~

Step-by-step explanation:

Given, P = 2 kVA = 2 kW,

t = 90 min = 1.5 h

(a) (i) Electrical Energy Consumed = power * time

= 2 kW x 1.5 h

= 3 kWh ( or 3 commercial unit)

(ii) Since 1 kW = 3.6 x 10^6 J

therefore,

Electrical energy consumed = 3 x 3.6 x 10^6 J

= 1.08 x 10^7 J

(b) Cost of electricity

= energy consumed in kWh x cost per kWh

= 3 x Rs 4.50 = Rs. 13.50

Hope it helps you!!