Electricity and Magnetism Unit Review

Which term describes the resistance that an electrical conductor offers to the flow of electric current?

• resistivity

• conductivity

• inductance

• capacitance

Consider the following electrical circuits. Which circuit will continue to function if one bulb fails?

• Circuit A: This is a series circuit; if one bulb fails, the entire circuit will stop functioning.

• Circuit B: This is a parallel circuit; one bulb failing will not affect the other bulbs in the circuit.

• Circuit C: This circuit combines series and parallel elements; if a bulb in the series part fails, it will affect the circuit partially.

• Circuit D: This circuit is fully parallel; all bulbs will continue to function independently even if one fails.

Samantha is experimenting with a circuit for her science fair project. She uses a battery and two light bulbs. After setting up, she notices that one of the bulbs is not lighting up. She suspects a faulty bulb and replaces it, but the issue persists. What could be the most likely reason for this issue?

• The circuit might be a series circuit and there is a loose connection at one of the bulbs.

• The circuit might be a parallel circuit and the battery is not properly connected.

• The circuit might be a series circuit and the battery is not powerful enough to light both bulbs.

• The circuit might be a parallel circuit and one of the bulb holders is defective.

What is the power dissipation in a 240 volt appliance that has a resistance of 60 ohms?

• 960 watts

• 4 watts

• 240 watts

• 9600 watts

What role does the rotating part of an electric motor, known as the rotor, play in its operation?

• The rotor converts electrical energy into mechanical energy.

• The rotor stores electrical energy for later use.

• The rotor stabilizes the motor's magnetic field.

• The rotor generates electricity to power the motor.

Tags

NGSS.HS-PS3-3

The diagram below shows three light bulbs connected in a parallel circuit with an open switch. Which light bulb will be turned off by the opened switch?

• Light bulb 1

• Light bulb 2

• Both light bulbs 2 and 3

• Both light bulbs 1 and 2

A student designs an electrical circuit with a 9-volt battery and connects it to a single resistor. After measuring the current, the student replaces the resistor with another of higher resistance. What effect does this change have on the circuit?

• A) The current in the circuit decreases.

• B) The current in the circuit increases.

• C) The voltage across the resistor increases.

• D) The voltage across the resistor decreases.

A 220V wall outlet has a resistance of 4.4 ohms. What is the amount of current flowing to the outlet?

• 0.08 A

• 50.0 A

• 100.0 A

• 500.0 A

A 24 volt battery is connected in series with a resistor. If the current measured by the ammeter is 1.2 amperes, what is the resistance of the resistor?

• 10 ohms

• 20 ohms

• 28 ohms

• 30 ohms

A toaster operates at 120 volts and has a resistance of 48 ohms. Calculate the current flowing through the toaster.

• A. 0.4 amperes

• B. 2.5 amperes

• C. 5 amperes

• D. 10 amperes