Question

In a step-down transformer, the number of turns in the primary are:
(A). Primary are less
(B). Primary are more
(C). Primary and secondary are equal
(D). Secondary are infinite.

Answer 1

Hint: In a step-down transformer we know that the output voltage is less than the input voltage. Turns ratio is needed to solve the question further. From the turns ratio relation, we can do a comparison and find the answer.

Complete step-by-step answer:
In a step-down transformer, the output voltage is lesser than the input voltage,
According to the turns ratio, if ${V_s}$ and ${V_p}$ are voltage of secondary and primary coil respectively, and Ns and Np are the number of turns in the secondary and primary coils respectively then,
$\dfrac{{{V}_{p}}}{{{V}_{S}}}=\dfrac{{{N}_{p}}}{{{N}_{s}}}$
In a step-down transformer output voltage is lesser than the input voltage so,
Vp>Vs
And according to the turns ratio,
Np>Ns
Hence the answer is option B, In a step down transformer the number of turns in primary is more than secondary.
Additional Information:
The transformer is an apparatus generally placed at two points,before the receiver get the supplied current and at the center of supplied current distribution.
Transformer is used to step up voltage and step down voltage, it is done so that without voltage loss a current can travel a longer distance.
The ratio of the number of turns on the primary coil of an electrical transformer to the number on the secondary is known as turns ratio.
A step-down transformer converts the high voltage and low current from the primary side of the transformer to the low voltage and high current value on the secondary side of the transformer

Note: Students need to learn the turns ratio properly, we can see from the turns ratio that with the increase in voltage number of turns on the core of the transformer also increases.The more the turns more is the voltage.