Primary of a transformer is connected to `.5 V dry cell. What will be the output voltage?

A transformer of 100% efficiency has 500 turns in the primary and 10,000 turns in the secondary coil. If the primary is connected to 220V mains supply, what is the voltage across the secondary coil?

When a voltage of 120 V is impressed across the primary of a transformer, the current in the primary is 1.85 mA. Find the voltage across the secondary, when it delivers 150 mA. The transformer has an efficiency of 95 %.

The output voltage of an ideal transformer, connected to a 240 V a.c mains, is 24 V. When this transformer is used to light a bulb with rating 24V - 24W, calculate the current in the primary coil of the circuit.

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

Calculate the current draws by the primary of a transformer, which stpeps down 200V to 20V to operate a device of resistance 20 ohm. Assume the efficiency of the transformer to be 80%.

An a.c. voltage of 200 V is applied to the primary of a transformer and voltage of 2,000 V is obtained form the secondary. Calculate the ratio of the currents through the primary and secondary coils.