Skip to content

Course home

Sign up

4.5.6a Construction and operation of a transformer

EasyMedium
12345678910111213141516171819202122232425262728293031323334353637383940414243
Question 41

A student designs a step-up transformer with an iron core. The input alternating current (a.c.) supply has an electromotive force (e.m.f.) of 24.0 V24.0\text{ V}24.0 V, and the expected output potential difference (p.d.) is 120 V120\text{ V}120 V.

a.

State whether the primary or the secondary coil should have more turns, and calculate the ratio of the number of turns in the secondary coil to the primary coil, NsNp\frac{N_s}{N_p}Np​Ns​​.

[3]
b.

Explain the function of the iron core in the transformer.

[2]
c.

A device of resistance 150 Ω150\ \Omega150 Ω is connected across the secondary output. Assuming the transformer is 100%100\%100% efficient, calculate the input current to the transformer.

[3]
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.

Question bank