Question

if a bulb labelled as 100w/230w is connected to 115w power supply what will be its power? ​

Answer 1

Answer:

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Explanation:

The bulb is rated 100W,220V.

The maximum current drawn by the bulbis given by,

I=

V

P

=

220

100

=

11

5

A

when the voltage is 115V then, the power consumed canbe given as

P=VI

=115×

11

5

=52.28J/s

But it is lighted for 20min So, the total energy consumed is given by

E=P×T=52.28×20×60=62736J

∴62736Jwill be liberated by thhe bulb in 20min in form of heat and light energy.