Electricity and Magnetism

What is the role of a battery in an electric circuit?

• It provides the electric current needed to power the circuit.

• It acts as a resistor to limit current flow.

• It stores electrical energy for future use.

• It converts AC to DC voltage.

What happens when an object with a negative charge comes near another object with a negative charge?

• The objects attract each other.

• The objects repel each other.

• The objects become neutral.

• The objects explode.

How can you increase the strength of an electromagnet?

• Use a stronger battery or add more wire coils.

• Decrease the number of wire coils.

• Use a weaker battery.

• Add a non-magnetic core.

Where is the magnetic field strongest?

• At the equator.

• At both of the poles.

• In the center of the Earth.

• At the surface of the Earth.

What is a conductor?

• A material that allows electricity to flow through it easily.

• A material that prevents electricity from flowing.

• A type of electrical device that stores energy.

• A material that only conducts heat, not electricity.

What is an insulator?

• A material that allows electricity to flow easily.

• A material that does not allow electricity to flow through it easily.

• A device that stores electrical energy.

• A type of conductor that enhances electrical flow.

What is a magnetic field?

• An area around a magnet where magnetic forces can be felt.

• A type of energy that can be seen with the naked eye.

• A region where electric charges are stored.

• A force that only acts on metal objects.

What is required for an electric circuit to conduct electricity?

• The circuit must be a complete loop or circle.

• The circuit must have a battery and a light bulb.

• The circuit must be made of copper wire only.

• The circuit must be connected to a power outlet.

What is the difference between AC and DC current?

• AC (Alternating Current) flows in one direction, while DC (Direct Current) changes direction periodically.

• AC (Alternating Current) changes direction periodically, while DC (Direct Current) flows in one direction.

• AC (Alternating Current) is used in batteries, while DC (Direct Current) is used in household outlets.

• AC (Alternating Current) is more efficient than DC (Direct Current) for long-distance transmission.

What is the function of a light bulb in a circuit?

• It converts electrical energy into light energy.

• It stores electrical energy for later use.

• It increases the voltage in the circuit.

• It acts as a resistor to limit current.