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7.3 Induced potential, transformers and the National Grid (HT only)

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Question 7
H

The transformer inside a phone charger is 100% efficient. The charger is connected to the 230 V mains supply. The output of the charger is 5.0 V and the current in the output is 1.8 A.

a.

Calculate the power output of the charger.

[2]
b.

Calculate the current drawn from the mains supply. Use the equation Vs×Is=Vp×IpV_s \times I_s = V_p \times I_pVs​×Is​=Vp​×Ip​

[2]
Markscheme

7.3 Induced potential, transformers and the National Grid (HT only) Questions

  1. GCSE
  2. /Physics
  3. /7.3 Induced potential, transformers and the National Grid (HT only)

40 exam-style questions on AQA GCSE Physics 7.3 Induced potential, transformers and the National Grid (HT only), covering 7.3.1 Induced potential (HT only), 7.3.2 Uses of the generator effect (HT only), 7.3.3 Microphones (HT only), and 7.3.4 Transformers (HT only). Each one has a worked solution and a mark scheme showing where the marks go.

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