Understanding Electric Current

What is one effect of electric current on a wire?

• It increases the wire's length.

• It generates heat.

• It produces light.

• It creates a magnetic field.

Which material is a good conductor of electricity?

• Copper

• Glass

• Rubber

• Wood

What happens to a light bulb when electric current flows through it?

• The light bulb cools down as the electric current flows through it.

• The light bulb emits light as the filament heats up due to the electric current.

• The light bulb produces a loud sound when current passes through it.

• The light bulb changes color but does not emit light.

Name a common insulator used in electrical wiring.

• Aluminum

• Iron

• PVC

• Copper

How does electric current create a magnetic field?

• Electric current creates a magnetic field by the flow of electrons in a vacuum.

• Magnetic fields are created by static electricity without any current flow.

• Electric current creates a magnetic field by the movement of charged particles in a conductor.

• Electric current generates a magnetic field only in superconductors.

What device is used to measure electric current?

• capacitor

• ammeter

• ohmmeter

• voltmeter

What is the unit of electric current?

• Ampere

• Watt

• Ohm

• Volt

What effect does electric current have on a magnet?

• Electric current weakens a magnet.

• Electric current has no effect on a magnet.

• Electric current generates a magnetic field.

• Electric current causes a magnet to lose its polarity.

Which of the following is an example of a conductor: rubber, copper, or wood?

• aluminum

• copper

• plastic

• glass

What happens to the resistance of a conductor as its temperature increases?

• The resistance of a conductor fluctuates randomly with temperature changes.

• The resistance of a conductor increases as its temperature increases.

• The resistance of a conductor decreases as its temperature increases.

• The resistance of a conductor remains constant regardless of temperature changes.