You are given five light bulbs designed to operate on 160 mA current at 3.0 V (r

Question

You are given five light bulbs designed to operate on 160 mA current at 3.0 V (rms values), and want to connect them in parallel, through an ideal transformer, to 120 V rms AC household power.

a) Draw a circuit diagram showing the AC power source (a generator symbol ? ), the transformer, and resistors for the light bulbs.

b) Is the required transformer step-up or step-down? What turns ratio Ns/Np is needed?

c) Calculate the rms current through both the primary and secondary coils of the transformer, in mA.

Explanation / Answer

Vs/Vp = Ns/Np

3/120 = Ns/Np

as we need to come to 3 V from 120 V thus we need a step down transformer

Vs/Vp = Ip/Is = Ns/Np

Is = 160 mA

Ip/160 = 3/120

Ip = 4 mA

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