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Course: Igcse Physics
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Igcse Physics

1. Motion, Forces and Energy

0/161 Dr Dabour Hub Science Diagram and Course Material

2. Thermal Physics

0/75 Dr Dabour Hub Science Diagram and Course Material

3. Waves

0/77 Dr Dabour Hub Science Diagram and Course Material

4. Electricity and Magnetism

0/119 Dr Dabour Hub Science Diagram and Course Material

5. Nuclear Physics

0/39 Dr Dabour Hub Science Diagram and Course Material

6. Space Physics

0/47 Dr Dabour Hub Science Diagram and Course Material
Quiz

4.4.9 Transformer Calculations – Check yourself

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  • Questions count: 6
  • Passing grade: B+
  • Time limit: 10 minutes
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1.
The equation that links turns and voltages is
Vp/Vs = Ns/Np
Vp x Vs = Np x Ns
Vp/Vs = Np/Ns
Vp + Vs = Np + Ns
2.
A transformer has 100 primary turns and 500 secondary turns. The primary voltage is 20 V. The secondary voltage is
100 V
4 V
500 V
2500 V
3.
An ideal step-down transformer has a primary current of 2.0 A at 240 V and a secondary voltage of 12 V. The secondary current is
0.10 A
2.0 A
4.0 A
40 A
4.
A transformer takes 100 W and gives 90 W. Its efficiency is
10%
90%
110%
100%
5.
In a step-up transformer the secondary current compared with the primary current is
smaller
larger
equal
zero
6.
A transformer has Np = 200, Ns = 800. The ratio Is / Ip for an ideal transformer is
4
16
1
0.25
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Part of 4. Electricity and Magnetism — see every lesson and quiz in this unit.
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