Electricity and Waves Test Review - Version 2

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

• It provides energy to the circuit.

• It reduces the amount of current.

• It absorbs electrical energy.

How does increasing the number of batteries in series affect the brightness of a lightbulb?

• It decreases the brightness of the lightbulb.

• It turns off the lightbulb.

• It increases the brightness of the lightbulb.

Which material allows electrical current to pass through it easily?

• Rubber

• Copper

• Plastic

What happens when an electric charge flows through a circuit?

• It stops electric devices from working.

• It generates electrical current.

• It generates thermal energy only.

How can you identify if a lightbulb is connected in a closed circuit?

• The lightbulb remains off

• The lightbulb makes a noise

• The lightbulb lights up

How does adding more batteries affect current in a circuit?

• It increases the current.

• It decreases the current.

• It doesn’t change the current.

What happens to current when a switch in a circuit is open?

• The current flows faster.

• The current reverses direction.

• The current stops flowing.

Resistors affect current in an electric circuit by:

• increasing the current

• decreasing the current

• having no effect on the current

• reversing the current direction

According to Ohm’s law, what happens to current if resistance is increased, keeping voltage the same?

• Current increases

• Current decreases

• Current remains the same

Which part of the motor is magnetized and interacts with the other components to create movement?

• Plastic cup

• Coil of wire (electromagnet)

• Rubber bands