1.

In an ideal transformer, the voltage is stepped down from 11 kV to 220 V. If the primary current be 100 A, the current in the secondary should be ……

Answer»

5 KA
1 kA
0.5 kA
0.1 kA

Solution :`epsilon_1=11xx10^3V , epsilon_2`=220 V, `I_1`= 100 A, `I_2` = ?
For an ideal transformer
`P_1=P_2`
`epsilon_1I_1=epsilon_2I_2`
`I_2=epsilon_1/epsilon_2I_1`
`=(11xx10^3xx100)/220`
`=5xx10^3` A
`therefore I_2`= 5 kA


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