Question

A torch bulb is rated 5V and 500 mA. Calculate its
(i) Power
(ii) Resistance
(iii) Energy consumed when it is lighted for 2.5 hrs​

Answer 1

Answer:

1

Explanation:

1+1111111111111112234557788

Answer 2

V = 5V

I = 500 mA = 0.5 A

t = 2.5 hrs = 9000 sec

(i) Power, P = VI

P = 5(0.5) = 2.5 W

(ii) Resistance, R = V/I

R = 5/0.5

R = 10 ohm

(iii) Energy consumed, E = Pt

E = 2.5(9000)

E = 22500 J

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