Electric Generators and Energy Conversion

What is the primary function of an electric generator?

• To convert electrical energy into mechanical energy.

• To store electrical energy.

• To generate electricity.

• To convert chemical energy into electrical energy.

What is the energy conversion that occurs in a cell?

• Mechanical energy to electrical energy.

• Chemical energy to electrical energy.

• Electrical energy to chemical energy.

• Thermal energy to electrical energy.

What is the energy conversion that occurs in an electric generator?

• Electrical energy to mechanical energy.

• Chemical energy to electrical energy.

• Mechanical energy to electrical energy.

• Thermal energy to mechanical energy.

On what principle does an electric generator operate?

• Fleming's Left Hand Rule.

• Electromagnetic induction.

• Ohm's Law.

• Joule heating effect.

When the coil rotates clockwise, and wire AB moves upwards, what is the direction of the induced current in wire AB?

• From A to B

• From B to A

• Out of the page

• Towards the North pole

What is the induced current in the wires BC and AD of the rotating coil?

• Maximum

• Minimum

• Zero

• Alternating

After half a revolution of the coil, what is the direction of the current flow in the external circuit (through the galvanometer)?

• From B1 to B2

• From B2 to B1

• No current

• Alternating

If the frequency of alternating current in a region is 50 Hz, how many times does the current change its direction in one second?

• 25 times

• 50 times

• 100 times

• 200 times

What is the primary energy source used to rotate the turbine in a hydroelectric power station?

• Energy generated from burning coal

• Energy released in a nuclear reaction

• Energy of fast-flowing water

• Mechanical energy from a generator

What is the defining characteristic of alternating current (AC)?

• It flows in a single, constant direction

• Its direction continuously switches

• It is produced by simple cells

• It always has a very low voltage