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a step down transformer is used for recharging the batteryof portable devices. the rturns ratio for...

a step down transformer is used for recharging the batteryof portable devices. the rturns ratio for a piticalyr transformer used in a radio is 1:13 when used with 120 b household service the transformer draws an rms current of 250 ma find (a) rms output voltage of the transformer (b) power delivered by the radio

Science   Advanced-Physics   
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Answer #1

a) We have the relation between the input and output voltage of an ideal transformer to the number of turns by the equation,

Where V2 is the output voltage,

V1 is the input voltage

is the ratio of number of turns,

So, the output rms voltage is given,

b) The input and output current is given by the relation..

So, the output current is given by,

The power delivered is given by,

The power delivered is 30 W.

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