J

11

SPH3U -

000

OOO

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Electricity & Magnetism Test

1. A laptop charger requires an operating voltage of 12 V to function

safely. If the input voltage into the charger is 120 V;

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b) If the current in the primary coil of the transformer from part a) is

0.15 A, determine the current in the secondary coil.

a) Determine the number of turns in the secondary winding of the step

down transformer if the number of turns in the primary winding is

40.

MacBook Air

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A

19

c) ***When the laptop is plugged into the charger, it takes 300,000 J of

electrical energy to be completely charged. How many hours will it

take to fully charge the laptop?

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Pane

DII

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Focus

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