Electric Current and Circuits Quiz

What is the unit of electric current?

• Volt

• Ampere

• Ohm

• Watt

Which of the following materials is a good conductor of electricity?

• Rubber

• Glass

• Copper

• Wood

If a circuit has a current of 3 A and a resistance of 4 Ω, what is the voltage across the circuit?

• 7 V

• 12 V

• 1.33 V

• 0.75 V

What is the resistance of a resistor if a current of 2 A flows through it when a voltage of 10 V is applied?

• 5 Ω

• 20 Ω

• 0.2 Ω

• 8 Ω

Which of the following statements is true about electric current?

• It is the flow of protons.

• It is the flow of neutrons.

• It is the flow of electrons.

• It is the flow of atoms.

Calculate the resistance of a wire if the voltage across it is 15 V and the current flowing through it is 3 A.

• 45 Ω

• 5 Ω

• 0.2 Ω

• 18 Ω

What is the formula for Ohm's Law?

• $V = I + R$

• $V = I \times R$

• $V = I / R$

• $V = R / I$

If the resistance in a circuit is doubled while the voltage remains constant, what happens to the current?

• It doubles.

• It halves.

• It remains the same.

• It becomes zero.

A circuit has a resistance of 10 Ω and a current of 0.5 A. What is the voltage across the circuit?

• 5 V

• 20 V

• 0.05 V

• 2 V

Which of the following is a correct statement about resistance?

• It is measured in volts.

• It is the opposition to the flow of current.

• It is the flow of electric charge.

• It is measured in amperes.