AC and DC

AC stands for __________ current.

• alternating

• Adjusting

• Alarmed

• Additional

DC stands for __________ current.

• deviating

• default

• diverging

• direct

Dynamos are generators that produce direct current.

• True

• False

Dynamos contain...

• slip rings

• a split-ring commutator

AC can be changed to DC using a __________.

• diode

• switch

• LDR

• Thermistor

Select the correct voltage graph for a dynamo.

• 
• 
• 
• 

Select the devices that produce direct current.

• cell

• solar panel

• alternator

• dynamo

Select the correct voltage graphs for a cell.

• 
• 
• 
• 

Alternating current is produced in most power stations.

• True

• False

Mains current has a frequency of 50 Hz. This means it changes direction 50 times every __________.

• second

• Minute

• Time

• Hertz