Electromagnetic Induction and Alternating Currents

A transformer works on the principle of:

An ideal transformer has 200 turns in the primary and 1000 turns in the secondary. If the primary voltage is 220 V (AC), the secondary voltage is:

A step-down transformer:

Which loss in a transformer is reduced by using a laminated core?

A transformer with 90% efficiency draws 2 kW from a 220 V supply. Its secondary voltage is 110 V. The secondary current is about:

The primary of a transformer is connected to a steady DC battery. In the steady state, the secondary:

Electric power is transmitted over long distances at very high voltage mainly to:

The same power is transmitted through the same line, first at 1 kV and then at 10 kV. The power lost in the line in the second case is:

A transformer has more turns in its secondary coil than in its primary. It is a:

An ideal transformer has 500 primary turns and 50 secondary turns, with 220 V across the primary. An 11 Ω resistor is connected across the secondary. The primary current is:

Power of 220 kW is transmitted at 22 kV through a line of total resistance 10 Ω. The power lost in the line is:

For an ideal transformer, which of the following is the same in the primary and the secondary circuits?

The core of a transformer is made of soft iron because soft iron has:

An ideal transformer has 100 turns in the primary and 500 turns in the secondary. If the primary voltage is 20 V (AC), find the secondary voltage in volt.

An ideal transformer steps 220 V down to 11 V. The primary current is 0.5 A. Find the secondary current in ampere.

A transformer takes an input power of 500 W and delivers 450 W to its load. Find its efficiency in percent.

Power of 100 kW is transmitted at 5 kV through a line of total resistance 4 Ω. Find the power lost in the line in watt.