Question

15.
An electric bulb is rated 220 V and 100 W.
(a)
Find its resistance.
(b)
Calculate the energy consumed by bulb in a month of 30 days if it is operated
on 220 V daily for 10 hours. Find the cost of energy consumed at the rate of 5
per unit of electricity.
(2012)​

Answer 1

Answer:

(b)

Calculate the energy consumed by bulb in a month of 30 days if it is operated

on 220 V daily for 10 hours. Find the cost of energy consumed at the rate of 5

per unit of electricity.

(2012)

Answer 2

Answer:

(a)Resistance=484ohms

(b)Total cost=150Rs

Explanation:

P=V²/R

R=220×220/100

R=484ohms

E=Pt

E=100×10×30

=30000w/h

=30kw/hr

Cost= 30kw/hr×5Rs

=150Rs