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.

When an AC voltage of 220 V is applied to the capacitor C.

A voltage of 30 V is applied across a carbon resistor with first, second and third rings of blue, black and yellow colours respectvely. Calculate the value of current, in mA through the resistor.

A transformer has an efficiency of 80%. It works at 4 kilowatt and 100 volt. If the secondary voltage is 240 volt, calculate the primary and secondary currents.

Establish relation between voltage and current in primary and secondary coils of transformer.

A 60 W load is connected to the secondary of a transformer whose primary draws line voltage. If a current of 0.54 A flows in the load, what is the current in the primary 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 %.

A transformer whose efficiency is 90%, draws 5 A when 200 V is applied to its primary coil. If output is drawn at 300 V, what is the current in secondary coil ? If number of turns in primary coil is 500, what is the number of turns in secondary coil?

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

Show diagramatically two different arrangements used for winding the primary and secondary coils in a transformer. Assuming the transformer to be an ideal one write expressions fo rthe ratio of its output current to input current in terms of the number of turns in the primary and secondary coils. Mention two reasons for energy losses in an actual transformer.