Question

The output power in the step-up transformer used in practice is __________.
A. Greater than the input power
B. Equal to the input power
C. Less than the input power
D. None of the above

Answer 1

Transformers uses mutual induction to convert voltages from one value to another, transformer is a device that transforms voltages from one value to other value the use of induction step-up transformers is a transformer that will increase voltage,step-down transformer is a transformer that will decrease voltage The transformer equation displaying that the ratio of the secondary to primary voltages in a transformer equals the ratio of the number of loops of their coils.

Complete step by step answer:
For a transformer, the voltages throughout the primary and secondary coils are associated by equation, $\dfrac{{{V_s}}}{{{V_p}}} = \dfrac{{{N_s}}}{{{N_p}}}$ Where ${V_s}$ and ${V_p}$ are the voltages throughout secondary and primary coils having ${N_p}$ and ${N_S}$ turns.
The currents in amperes ${I_p}$ and ${I_s}$with inside the secondary and primary coils are associated by equation, $\dfrac{{{I_{\rm{s}}}}}{{{I_{\rm{p}}}}} = \dfrac{{{N_{\rm{p}}}}}{{{N_{\rm{s}}}}}$
As transformers perform at the primary principle of mutual induction, every character winding of a more than one winding transformer helps the identical number of volts in keeping with turn, consequently the volt-ampere product in every winding is the identical, that is $\;\dfrac{{{N_p}}}{{{N_s}}} = \dfrac{{{V_{_p}}}}{{{V_s}}}$ with any turns ratio among the character coil windings being relative to the primary supply.
In a step-up transformer power of it remains same but when used in a practise, power will be less than that of input power and hence voltage increases and current decreases.
The output power in a step-up transformer is less than that of input power supplied as getting full efficiency is practically impossible in practice.

Hence the correct option is C.

Note: A step-up transformer will increase voltage and reduces current, while a step-down transformer decreases voltage and will increase current. It depends on the number of turns provided in the primary and secondary windings.