Question

battery of 10 v is connected to a primary of a transformer of transformation ratio 20.The output across secondary is ?​

Answer 1

The output across secondary is zero.

• A transformer is a device, based on the principle of mutual induction, which is used for converting large alternate current at low voltage into small current at high voltage, and vice versa.
• A battery produces direct current but and a transformer works only on alternating current.
• When alternating current flows through the primary coil, then in each cycle of current, the core is magnetized once in one direction and once in the opposite direction.
• Hence an alternating magnetic flux is produced in the core.
• If a direct current flows through the primary coil, then the core magnetizes in only one direction and hence, the flux is not produced in the core.

• Therefore, the output across the secondary coil would be zero.