Electromagnetic Induction

Electromagnetic induction is the creation of a potential difference (or a current) when an electrical conductor is passed through a (a)   field.

How can the size of the induced potential difference be increased?

• Increase the speed of the movement

• Increase the number of coils

• Increase the current

• Use a bigger magnet

• Use a stronger magnet

If the direction of motion is reversed, the direction of the current...

• reverses

• stays the same

If there is no relative motion between the magnetic field and the conductor, there is no current induced.

• True

• False

Select the statements that apply to an alternator.

• Creates direct current

• Creates alternating current

• Has slip rings and brushes

• Has a split-ring commutator

AC stands for (a)   current.

DC stands for __________ current.

• deviating

• default

• diverging

• direct

Dynamos are generators that produce direct current.

• True

• False

Select the correct voltage graph for a dynamo.

• 
• 
• 
• 

Alternating current is produced in most power stations.

• True

• False