Lesson 2 Review

Why is copper often used in household wiring?

• Because it is a good conductor that allows electrical current to move easily

• Because it is cheaper than other materials

• Because it is an insulator

• Because it is a poor conductor of electricity

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.

What are materials like plastic and glass called?

• Insulators

• Conductors

• Metals

• Semiconductors

If two batteries are connected in series, how does the voltage compare to a single battery?

• The voltage of two batteries in series is the sum of the voltages of the individual batteries.

• The voltage remains the same as one battery.

• The voltage of two batteries in series is half the voltage of one battery.

• The voltage becomes zero.

Which of the following is NOT an insulator?

• Copper

• Plastic

• Glass

• Rubber

What measurement unit is used for electrical current?

• Amperes (A)

• Volts (V)

• Ohms (Ω)

• Watts (W)

How is a switch used in an electrical circuit?

• It opens or closes the circuit, allowing or stopping the flow of current.

• It increases the voltage in the circuit.

• It converts electrical energy into sound energy.

• It acts as a battery holder.

Which material is commonly used as an insulator in household wiring?

• Plastic

• Copper

• Gold

• Aluminum

Why do scientists repeat experiments under the same conditions?

• To increase confidence in the results and ensure the claim is reliable

• To use more materials and equipment

• To make their experiments more complex

• To change the variables each time

When drawing circuit diagrams, why are standard symbols used?

• To simplify the drawing process and avoid confusion

• To make the diagrams look more artistic

• To represent the power usage of each component

• To indicate the cost of each component