AC and DC generators

What is induced in a wire when it cuts through a magnetic field line?

• Electric current

• Resistance

• Electro-motive force (emf)

• Power

How do many generators work?

• By converting mechanical energy directly into electrical energy

• By rotating loops of wire in between the poles of a stationary magnet

• By using solar panels to generate electricity

• By heating a wire to generate electricity

What determines whether a generator will produce AC or DC?

• The type of fuel used

• The speed at which the generator operates

• How the coils of wire are connected to the circuit

• The color of the wire

How is electricity generated in an alternating current generator?

• By heating a coil of wire

• By rotating a coil of wire between the poles of a magnet

• By applying a direct current to a coil of wire

• By placing a coil of wire in a steady magnetic field

What is the function of the "brushes" in an alternating current generator?

• To clean the coil of wire

• To prevent the coil from rotating

• To make a sliding contact with the coil, allowing electricity to flow out

• To insulate the coil of wire

What is the role of the slip-rings in an alternating current generator?

• To provide a steady current

• To connect the coil to an external circuit

• To prevent the wires from getting twisted as the coil spins

• To convert alternating current to direct current

What type of current output does an alternating current generator produce?

• A constant positive current

• A constant negative current

• An output that goes positive then negative

• A direct current output

What is the name given to this type of generator?

• Dynamo

• Transformer

• Alternator

• Inverter

What is the function of the "brushes" in a direct current generator?

• To convert alternating current to direct current

• To stop the wires from getting twisted and tangled

• To increase the voltage of the current

• To reduce the resistance in the circuit

What does the split ring commutator do in a direct current generator?

• It ensures that one brush always connects with the wire moving up and the other with the wire moving down.

• It converts the mechanical energy into electrical energy.

• It maintains a constant speed of the rotating coils.

• It collects the generated electricity for external use.