Electromagnetic...

A step up transformer connected to a 220 V AC line is to supply 22 kV for a neon sign in secondary circuit. In primary circuit a fuse wire is connected which is to blow when the current in the secondary circuit exceeds 10 mA. The turn ratio of the transformer is

A transformer is used to

A step-up transformer operates on a 230 V line and supplies a load of 2 A. The ratio of the primary and secondary windings is 1: 25. The current in the primary is

The primary winding of transformer has 500 turns whereas its secondary has 5000 turns. The primary is connected to an ac supply of 20 V, 50 Hz. The secondary will have an output of

A step-down transformer is connected to main supply 200 V to operate a 6V, 30W bulb. The current in primary is

The number of turns in primary and secondary coils of a transformer are 100 and 20 respectively. If an alternating potential of 200 volt is applied to the primary, the induced potential in secondary, will be

The ratio of secondary to primary turns is 9 : 4. If power input is P, what will be the ratio of power output (neglect all losses) to power input

Voltage in the secondary coil of a transformer does not depend upon

In a step-up transformer the turn ratio is 1 : 10. A resistance of 200 ohm connected across the secondary is drawing a current of 0.5 A. What is the primary voltage and current?

Large transformers, when used for sometime, become hot and are cooled by circulating oil. The heating of transformer is due to