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A transformer has 300 turns of wire in the primary coil and 30 turns in...

Physics
JAMB 2020

A transformer has 300 turns of wire in the primary coil and 30 turns in the secondary coil. If the input voltage is 100 volts, the output voltage is 

  • A. 5 volts
  • B. 10 volts
  • C. 15 volts
  • D. 20 volts
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Correct Answer: Option B
Explanation

For transformation, Es = e.m.f. of secondary coil 

Ep = Np 

Np = e.m.f. of secondary coil 

Ns = number of turns in secondary coil 

Ns = number of turns in primary coil 

\(\frac{30}{300}\) = \(\frac{x}{100}\) = 300 

X = 3000 

X = 10 volts 

There is an explanation video available below.


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Explanation Video

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WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free