Electricity and Waves Test Review - Version 1

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.

• It acts as a switch in the circuit.

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

• It decreases the brightness of the lightbulb.

• It has no effect on the brightness.

• 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

• Glass

What happens when an electric charge flows through a circuit?

• It creates sound energy.

• 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

• The lightbulb blinks

How does adding more batteries affect current in a circuit?

• It increases the current.

• It decreases the current.

• It doesn’t change the current.

• It stops the current.

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

• The current stops flowing

• The current increases

• The current decreases

• The current remains the same

How do resistors affect current in an electric circuit?

• They decrease the current.

• They increase the current.

• They have no effect on current.

• They stop the current completely.

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

• Current becomes zero

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

• Plastic cup

• Coil of wire (electromagnet)

• Rubber bands

• Sandpaper