If no load is attached to the secondary winding of a transformer, what is current in the primary winding called?

A transformer operates a 6.3 volt 2 ampere light bulb from its secondary winding. The power consumed by the primary winding is approximately:

A transformer has a 240 volt primary that draws a current of 250 mA from the mains supply. Assuming no losses, what current would be available from a 12 volt secondary?

In a mains power transformer, the primary winding has 250 turns, and the secondary has 500. If the input voltage is 110 volts, the likely secondary voltage is:

The strength of the magnetic field around a conductor in air is:

Maximum induced voltage in a coil occurs when:

The voltage induced in a conductor moving in a magnetic field is at a maximum when the movement is:

A 100% efficient transformer has a turns ratio of 1/5. If the secondary current is 50 mA, the primary current is:

A force of repulsion exists between two _______ magnetic poles.

A permanent magnet would most likely be made from:

The fact that energy transfer from primary to secondary windings in a power transformer is not perfect is indicated by: