Transformers and the national grid

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Question 11
Medium

This question is about a transformer.

Calculate the current in the primary coil.

Use the information given in Figure 1 and the equations below.

VpVs=NpNs \frac{V_p}{V_s} = \frac{N_p}{N_s} Vs​Vp​​=Ns​Np​​ VpIp=VsIs V_p I_p = V_s I_s Vp​Ip​=Vs​Is​

The transformer is 100% efficient.

Figure 1: Schematic diagram of a step-up transformer with a laminated iron core. The primary coil on the left has 200 turns of wire and is connected to a 120 V AC supply. The secondary coil on the right has 800 turns of wire and carries a secondary current of 0.5 A.

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Transformers and the national grid Questions

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