Question

A torch bulb is rated at 3v and 600mA.calculate its a) power,b) resistance c) energy consumed if it is used for 4 hours

Answer 1

Answer:

Given that - V = 3 v

I = 600mA = 0.6 A

a) by the formula of power ,

P = V X I

P = 3 X 0.6 = 1.8 w

b) by ohms law , V = I X R

R = V / I

R = 3 / 0.6 = 5 Ohm

C ) T = 4 hrs = 4 x 60 x 60 = 14400sec

As by formula , P = E / T

E = P X T

E = 1.8 X 14400 = 25920J

E = 25.920 KJ

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