Electromagnetism and Transformers Quiz

Which of the following changes would NOT increase the induced current in a coil?

• Adding more coils

• Using a weaker magnet

• Increasing the diameter of the coils

• Moving the magnet faster

What effect does increasing the number of coils have on the induced current?

• Increases the current

• Decreases the current

• Reverses the direction of the current

• Has no effect on the current

In a transformer, if the secondary coil has four times the turns of the primary coil, what happens to the voltage?

• It is doubled

• It is halved

• It remains the same

• It is quadrupled

If a transformer operates at 100% efficiency, what can be said about the power in the primary and secondary coils?

• Power is conserved between the coils

• Power is doubled in the secondary coil

• Power is lost in the primary coil

• Power is lost in the secondary coil

How does the current in the primary coil compare to the secondary coil if the secondary has four times more turns?

• The current is halved in the primary

• The current is four times greater in the primary

• The current is four times greater in the secondary

• The current is the same in both coils