Understanding Ohm's Law and Circuits

What is Ohm's Law?

• V = I × R

• P = V × I

• R = V × I

• I = V × P

If the voltage across a resistor is doubled while the resistance remains the same, what happens to the current?

• It remains the same

• It doubles

• It halves

• It becomes zero

The SI unit of resistance is:

• Ampere

• Volt

• Ohm

• Coulomb

If a resistor has a resistance of 10Ω and a current of 2A flows through it, what is the voltage across it?

• 5V

• 10V

• 20V

• 40V

Ohm's Law is applicable to which type of conductors?

• Only semiconductors

• Only superconductors

• Only metallic conductors

• All conductors under constant temperature

If the resistance in a circuit increases while the voltage remains the same, what happens to the current?

• It increases

• It decreases

• It remains the same

• It becomes zero

The graph of voltage vs. current for a resistor is:

• A curved line

• A straight line passing through the origin

• A horizontal line

• A vertical line

What happens to resistance if the length of a conductor is doubled while keeping the cross-sectional area the same?

• It doubles

• It halves

• It remains the same

• It becomes zero

What happens to resistance if the temperature of a metallic conductor increases?

• Increases

• Decreases

• Remains the same

• Becomes zero

A 12V battery is connected to a 6Ω resistor. What is the current flowing through the circuit?

• 0.5A

• 2A

• 3A

• 6A