Correct Answer - Option 3 : 10 A, 100 A
Concept:
- The transformer basically changes the level of voltages from one value to the other at a constant frequency.
- It is a static device that transforms electrical energy from one circuit to another without any direct electrical connection between them.
- This is achieved with the help of mutual induction between the two windings.
- In a transformer electrical energy changes to electrical and heat energy.
In a transformer, the relation between the number of turns, current, and voltages is given by:
\(n = \frac{{{N_1}}}{{{N_2}}} = \frac{{{V_1}}}{{{V_2}}}=\frac{I_2}{I_1}\)
N1 and N2 = number of turns in the primary and secondary windings respectively
V1 and I1 = Voltage and current respectively at the primary end
V2 and I2 = Voltage and current respectively at the secondary end
Calculation:
Given Power = 25 kVA
V1 = 2500 V, 50 Hz supply
N1 = 600
N2 = 60
Power = V1 × I1
I1 = P / V1 = 25000 / 2500 = 10 A
\(\Rightarrow\frac{{{N_1}}}{{{N_2}}} = \frac{{{I_2}}}{{{I_1}}}\)
Putting on the respective values, we get:
\(\Rightarrow\frac{{{600}}}{{{60}}} = \frac{{{I_2}}}{{{10}}}\)
I2 = 100 V
The frequency of the secondary generated voltage will be the same as the input frequency.