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4.5.6a Construction and operation of a transformer

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Question 6

In an experiment, a student uses an electrical heater connected to a power supply.

a.

The current in the electrical heater is 1.8 A1.8\text{ A}1.8 A. The voltage (p.d.) across the heater is 20 V20\text{ V}20 V.

Calculate the energy transferred to the heater in 150 s150\text{ s}150 s.

energy transferred = ………………………………………… J\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\text{ J}………………………………………… J

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b.

The power supply is connected to the electrical mains by a cable that consists of three wires.

State the name for each of the three wires in the cable.

  1. ……………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots……………………………………
  2. ……………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots……………………………………
  3. ……………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots……………………………………
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c.

The power supply includes a transformer.

The voltage (VpV_{\text{p}}Vp​) across the primary coil of the transformer is 230 V230\text{ V}230 V. The voltage (VsV_{\text{s}}Vs​) across the secondary coil of the transformer is 20 V20\text{ V}20 V. The number of turns on the primary coil (NpN_{\text{p}}Np​) is 115011501150.

Calculate the number of turns (NsN_{\text{s}}Ns​) on the secondary coil.

number of turns on secondary coil = …………………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots…………………………………………

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Markscheme

4.5.6a Construction and operation of a transformer Questions

  1. IGCSE
  2. /Physics
  3. /4.5.6a Construction and operation of a transformer

136 exam-style questions on CIE IGCSE Physics 4.5.6a Construction and operation of a transformer. Each one has a worked solution and a mark scheme showing where the marks go.

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