Circuits and Resistance

Which of the following components in this circuit is a resistor?

• The light bulb

• The switch

• The battery

• The wire

Ohm's Law states that the voltage of a circuit is equal to the product of its current and resistance (V = IR). Which of the following statements correctly describes the relationship between voltage, current, and/or resistance?

• Current is directly proportional to voltage and indirectly proportional to resistance.

• Voltage is directly proportional to current and indirectly proportional to resistance.

• Resistance is directly proportional to voltage and current.

• Resistance is directly proportional to current and indirectly proportional to voltage.

According to Ohm's Law, which of the following statements is true?

• Resistance is equal to voltage times current (R = VI)

• Current is equal to voltage divided by resistance (I = V/R)

• Voltage is equal to current divided by resistance (V = I/R)

• Current is equal to voltage times resistance (I = VR)

What is an advantage of parallel circuits over series circuits?

• In a series circuit, if a single resistor (like a light bulb) stops working then the entire circuit stops working. In a parallel circuit, if a single resistor stops working, the rest of the circuit still works.

• In a series circuit, if a single resistor (like a light bulb) stop working, the rest of the circuit still works. In a parallel circuit, if a single resistor stops working, the entire circuit stops working.

• Parallel circuits do not require a switch like series circuits do.

• There is no advantage between parallel and series circuits.

Which of the following materials is an example of a good electrical conductor?

• Copper

• Glass

• Cloth

• Air

Which of the following is an example of a good electrical insulator?

• Glass

• Gold

• Salt Water

• Aluminum

How does the electrical resistivity of distilled water compare to the electrical resistivity of salt water?

• Distilled water, an insulator, has a higher resistivity than salt water, a conductor.

• Distilled water, a conductor, has a higher resistivity than salt water, an insulator.

• Distilled water, an insulator, has a lower resistivity than salt water, a conductor.

• Distilled water, a conductor, has a lower resistivity than salt water, an insulator.

Tags

NGSS.MS-PS2-3

You are trying to create a circuit to make an electric motor to work. The motor produces 2 ohms of resistance and requires 3 amps of current to operate. You attach a 4 volt battery to the circuit and the motor doesn't work due to insufficient current. What can you do to increase the current? (Remember V = IR)

• Increase the voltage of the circuit by using a 6 volt battery

• Decrease the voltage of the circuit by using a 2 volt battery.

• Increase the resistance of the circuit by using a motor with 4 ohms of resistance.

What is resistance the measure of?

• How easily charge can flow

• How hot a wire is

• How easily charge can be counted

• How many particles are in a wire

Calculate the voltage across the 8Ω resistor.

• 4 V

• 16 V

• 9 V

• 4.5 V