Unit 6 key terms - Magnetism and Electromagnetism

What happens when current flows through a wire?

• A magnetic field is generated around it.

• The wire heats up.

• The wire changes color.

• The wire becomes longer.

What does the strength of the magnetic field around a current-carrying wire depend on?

• The color of the wire.

• The magnitude of the current and the distance from the wire.

• The temperature of the wire.

• The length of the wire.

What is an electric motor?

• A device that stores electrical energy.

• A current-carrying coil of wire in a magnetic field.

• A machine that generates electricity.

• A device that measures current.

What is an electromagnet?

• A permanent magnet.

• A solenoid with an iron core.

• A device that stores magnetic energy.

• A coil of wire without a core.

What is Fleming’s Left-Hand Rule used for?

• To measure the strength of a magnetic field.

• To determine the orientation of force, current, and magnetic field.

• To calculate the speed of an electric motor.

• To find the resistance in a circuit.

What is the generator effect?

• The production of heat in a conductor.

• The induction of voltage when there is relative motion between a conductor and a magnetic field.

• The conversion of sound into electrical signals.

• The storage of electrical energy in a battery.

What is an induced magnet?

• A permanent magnet.

• A material that becomes a magnet in an existing magnetic field.

• A device that generates electricity.

• A coil of wire with no magnetic properties.

What happens when like magnetic poles are brought near each other?

• They attract each other.

• They repel each other.

• They have no effect on each other.

• They become stronger.

What does a loudspeaker do?

• Converts sound into electrical signals.

• Converts variations in current into vibrations of a diaphragm.

• Stores electrical energy.

• Measures the strength of a magnetic field.

What do magnetic field lines show?

• The temperature of a magnet.

• The strength and direction of a magnetic field.

• The color of a magnetic field.

• The weight of a magnet.