Question

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50pts ___

Q. A current 4 A flows through a 12 V car headlight bulb for 10 mins. How much energy transfer occurs during this time?

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Answer 1

Energy =power *time............ (1)

First we calculate power P by using the current 4A and voltage of 12V.

Now, P =V*I

P =12*4

P =48 watts =0.048kilowatts

Time =10 minutes =10/60=1/6 hours

Now putting p=0.048KW and t=1/6 hours in (1) equation,

E=0.048*1/6=0.008KWh

Answer 2

Given :-

Current, I = 4A

Potential Difference, V = 12v

Time duration, t = 10mins => 600sec

To find :- Energy (E)

Solution:-

Energy = P.D x current x time

E = VIt

E = 12 x 4 x 600

E = 28800 Joule

Energy = 2.88 x 10^4 J

Hope this helped you.

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