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JAMB Physics 2023 Paper

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Question : 31

Total: 65

A step-down transformer is used on a 2.2 kV line to deliver 110 V. How many turns are on the primary windings if the secondary has 25 turns?

20
250
200
500

Solution:

Ep = 2.2kV = 2200V; Es=110V; Ns=25; Np=?

=

\frac{E_p}{E_s}

=

\frac{N_p}{N_s}

= $\frac{2200}{110}$ = $\frac{N_p}{25}$

=110 × Np = 2200 × 25

=

N_p

=

\frac{55,000}{110}

∴

N_p

= 500 turns

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