A transformer is designed to convert an AC voltage of `110 V` to an `AC` voltage of `12V`. If the input terminals are connected to a `DC` voltage of `110 V`, the transformer usually burns. Explain.

The peak voltage in a 220 V AC source is

The rms value of an AC. voltage with a peak value of 311 V is:

A transformer has 50 turns in the primary and 100 in the secondary. If the primary is connected to a 220 V DC supply, what will be the voltage across the secondary?

In step-up transformer the output voltage is 11 kV and the input voltage is 220 V. The ratio of number of turns of secondary to primary is:

A transformer connected to 220 V mains is used to light a lamp of rating 100 W and 110 V. If the primary current is 0.5 A, the effeciency of the transformer is (approximately)

An electric bulb is designed to operate at 12 volts DC . If this bulb is connected to an AC source and gives normal brightness, what would be the peak voltage of the source?

A step down transformer convert a voltage of 2200 V into 220V in the transmission line. Number of turns in the primary coil is 5000. Efficiency of transformer is 90% and its output power is 8kW. Calculate (i) the number of turns in the secondary coil, (ii) input power.

A transformer is used to light a 100W and 110V lamp from 220V mains. If the main current is 0.5 amp, fhe efficiency of the transformer is approximately:

If the voltage between the terminals A and B is 17 V and Zener breakdown voltage is 9 V , then the potential across R is