Basic Electricity

Which of the following is the correct statement of Ohm’s Law?

• When current increases in a circuit, voltage increases and resistance increases.

• When current increases in a circuit, voltage decreases and resistance increases.

• When current decreases in a circuit, voltage decreases and resistance increases.

• When current increases in a circuit, voltage increases while resistance remains constant.

Consider a simple electric circuit with a voltage source of 20.0 V which has a current of 0.500 A. What is the resistance of the load?

• 20.0 ohms

• 30.0 ohms

• 40.0 ohms

• 50.0 ohms

According to Ohm’s law, across a resistor with constant resistance, what happens to the current across it when the voltage applied is halved?

• A. halved

• B. doubled

• C. quadrupled

• D. remains the same

It is a difference in electric potential energy in joule/coulomb.

• A. Circuit

• B. Current

• C. Resistance

• D. Voltage

What is the SI unit of voltage?

• A. ampere

• B. ohm

• C. volt

• D. watt

It is the opposition to the flow of electric charges as they travel through a conducting wire.

• Circuit

• Current

• Resistance

• Voltage

What is the SI unit of resistance?

• A. ampere

• B. ohm

• C. volt

• D. watt

It converts electrical energy into different forms of energy such as light, heat, or sound in an electric circuit.

• Load

• Switch

• Voltage source

• Conducting wire

Tags

NGSS.HS-PS3-3

A water heater has a resistance of 22 Ω connected to a 220-V voltage source. What is the needed current to operate the heater?

• A. 5 A B.

• 7 A

• C. 8 A

• D. 10 A

A motorcycle starter motor needs 40.0 A to operate with a resistance of 0.150 ohms. What is the needed voltage to start the motor?

• A. 5.00 V

• B. 6.00 V

• C. 7.00 V

• D. 8.00 V