Transformers and the national grid

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Question 10
Easy

Figure 1 shows the details of a step-down transformer used for a laptop charger.

Diagram of a step-down transformer with a laminated iron core. The primary coil on the left side has 4,600 turns, an alternating potential difference of 230 V, and a current of 0.40 A. The secondary coil on the right side has 230 turns, a potential difference of 11.5 V, and a current of 8.0 A.

Calculate the power in the primary coil.

Use the equation:

power=potential difference×current \text{power} = \text{potential difference} \times \text{current} power=potential difference×current
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Transformers and the national grid Questions

  1. GCSE
  2. /Physics
  3. /Transformers and the national grid