Question

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Answer 1

Answer:

Power can be defined as the rate at which energy is transferred to heat .

(i)Given, V=5V

I=500mA=0.5A

P=VI

P=5×0.5

P=2.5W

(ii)R=V/I

R=5/0.5

R=10 ohm

(iii)t=2.5hrs=5/2 hours

E=P×t

E=2.5×2.5

E=6.25joule

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Answer 2

Answer:

Power is the work per unit time

Explanation: