Pretest 301

Which of the following principles explains how an electric motors works?

• Magnetic force

• Magnetism

• Electrolysis

• Electromagnetism

Which is NOT a distinguishing feature of an electric generator?

• Electric generator converts mechanical energy into electrical.

• Electric generator converts electrical energy into mechanical energy.

• It generates electricity.

• It is based on the principle of electromagnetic induction.

What do we call a device that converts electricity into mechanical movement?

• Electric charge

• Electric motor

• Electric current

• Electric generator

What do you call a device that converts mechanical movement into electricity?

• Electric field

• Electric motor

• Electric generator

• Plasma generator

Which of the following situations illustrate how a simple electric motor works?

• A. The energy stored in the car’s batteries is converted into the rotation of the wheels.

• B. Electrical energy turned into rotation of the blades in the food processor and cut up food.

• C. Both A and B

• D. None of these

Which of the following is a device that converts electrical energy into mechanical energy?

• Vacuum cleaner

• Bicycle

• Weighing scale

• All of these

What two forces are required for generators and electric motors to work?

• Magnetic and thermal

• Magnetic and radiant

• Electric and thermal

• Electric and magnetic

What would happen to the coiled wire in an electric motor model if there is a repulsion and attraction of the magnetic poles?

• The coil fluctuates and converts electrical energy into chemical energy.

• The coil stops and changes mechanical energy into electrical energy.

• The coil rotates and changes electrical energy into mechanical energy.

• The coil remains stable.

What do you call a huge wheel that rotates when pushed by water, wind, or steam (associated with generators)?

• Turbine

• Magnet

• Motor

• Pipe

What do you call a devise that produces an electric current when a coil of wire is wrapped around an iron core and rotated near a magnet?

• Magnet

• Car

• Generator

• Motor