Alternators and Dynamos

What do alternators and dynamos use to produce electric power?

• Chemical reactions

• Magnetic fields

• Mechanical energy

• Solar energy

Which of the following vehicles uses alternators to charge their batteries?

• Cars

• Electric scooters

• Bicycles

• Sailboats

What is the main difference between alternating current and direct current?

• The color of the wire

• The direction of electron flow

• The source of power

• The speed of electron flow

What does an alternator generate?

• Static electricity

• Magnetic fields

• Direct current

• Alternating current

What is used by a dynamo to generate direct current?

• A constant magnetic field

• A change in magnetic field

• Solar panels

• A battery

What is the role of commutator rings in an alternator?

• They connect the wire coil to complete the circuit

• They break the circuit

• They store electric energy

• They convert AC to DC

What happens to the potential difference when the wire coil is not cutting the magnetic field?

• It reverses direction

• It drops to zero

• It increases

• It remains constant

What does the split ring commutator do in a dynamo?

• Decreases the current

• Keeps the direction of current constant

• Increases the current

• Changes the direction of current

How can the size of the current be increased?

• By increasing the size of the magnetic field

• By decreasing the number of turns on the coil

• By slowing down the rotation speed of the coil

• By using a smaller coil