Part A How many turns does the primary coil on the transformer have if the secon

Question

Part A How many turns does the primary coil on the transformer have if the secondary coil has 140 turns? Express your answer using two significant figures. prim turns Submit My Answers Give Up Part B No energy is lost in an ideal transformer, so the output power Pout from the secondary coil equals the input power in to the primary coil. Suppose a neighborhood transformer delivers 300 A at 120 V.What is the current in the 1.4x104 V line from the substation? Express your answer using two significant figures Submit My Answers Give Up

Explanation / Answer

using principle of transformer

N1/N2 = V1/V2

N1/140 = (1.4*10^4)/120

N1 = 16333 is the no.of turns in the primary coil

and also Pout = Pin

V1*I1 = V2*I2

1.4*10^4*I1 = 120*300

I1 = 2.57 A

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