Question

0.22. An electric bulb is rated at 200 V-100 W. What is its resistance? Five such bulbs burn for 4 hours
What is electrical energy consumed? Calculate the cost if the rate is 50 paisa per unit​

Answer 1

Explanation:

Total power consumption per hours

100 x 5 x4 = 2000

2000/1000 =2

cost if the rate is 50 paisa per unit

= 0.5 x2 = 1.0 rupee.

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Answer 2

Using, P = V²R

we get R = V²P

= (200)²100

= 400

Energy consumed = P x t

= 100 x 4

= 400 Wh

= 0.4 kWh

Cost at the rate of 50 paise per unit

= Rs (0.50 x 0.4)

= Rs 2

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