Electricity - Ch 15

When an atom loses electrons, its charge becomes

• neutral
• positive
• negative
• positive or negative

Which of the following is an example of a conductor?

• glass
• rubber
• plastic
• salt water

Why is an insulator used in a circuit?

• An insulator helps keep the electric charges inside the pathway.
• An insulator transforms electrical energy into other forms of energy.
• An insulator provides the energy to pump electric charges through the circuit.
• An insulator provides the pathway electric current moves through.

Which of the following parts of a circuit acts as a resistor?

• battery
• light bulb
• copper wire
• on/off switch

How many resistors does this circuit diagram show?

• 1
• 3
• 5
• 4

How is a parallel circuit different from a series circuit?

• A series circuit has more than one pathway for electrical energy to move through.
• A parallel circuit has more than one pathway for electrical energy to move through.
• A series circuit provides more electrical energy.
• A parallel circuit provides more electrical energy.

How can you make an electromagnet stronger?

• add more coils of wire
• remove some coils of wire
• place a plastic bar inside the coils
• attach some of the coils to a plastic bar inside the coils

What is the definition of a superconductor?

• It has no resistance to electrical current.
• It has a high resistance to electrical current.
• It conducts electricity at super high pressures.
• It conducts electricity at super high temperatures.

Why does a balloon rubbed on a sweater stick to a wall?

• The balloon's charge repels the charge of the wall.
• The balloon's charge attracts the charge of the wall.
• The balloon's charge is equal to the charge of the wall.
• The balloon's charge is greater than the charge of the wall.

Choose the word that belongs in the sentence.
A circuit with more than one resistor on a single wire is a _________ circuit.

• simple
• multiple
• complex
• series