Circuits AQA A Level Physics Quiz

What is the mathematical expression for Ohm's Law?

• V = I * R

• V = I / R

• V = I + R

• V = I ^ R

If the resistance in a circuit is 10 ohms and the current is 2 amps, what is the voltage?

• 5 volts

• 30 volts

• 20 volts

• 15 volts

A circuit consists of a 12V battery and a 4 ohm resistor. What is the current flowing through the circuit?

• 6A

• 2A

• 10A

• 3A

State Kirchhoff's first law.

• The total current entering a junction is greater than the total current leaving the junction.

• The total current entering a junction is less than the total current leaving the junction.

• The total current entering a junction is unrelated to the total current leaving the junction.

• The total current entering a junction is equal to the total current leaving the junction.

What is the difference between Kirchhoff's first and second laws?

• Kirchhoff's first law states the conservation of charge, while Kirchhoff's second law states the conservation of energy.

• Kirchhoff's first law states the conservation of mass, while Kirchhoff's second law states the conservation of charge.

• Kirchhoff's first law states the conservation of momentum, while Kirchhoff's second law states the conservation of energy.

• Kirchhoff's first law states the conservation of energy, while Kirchhoff's second law states the conservation of charge.

In a series circuit with three resistors of 4 ohms each, what is the total resistance?

• 2 ohms

• 8 ohms

• 16 ohms

• 12 ohms

In a series circuit with three resistors of 4 ohms each, what happens to the current if one resistor is removed?

• The current becomes zero

• The current increases

• The current remains the same

• The current decreases

In a parallel circuit with three resistors of 4 ohms each, what is the total resistance?

• 12 ohms

• 1.33 ohms

• 0.75 ohms

• 2.67 ohms

In a parallel circuit with three resistors of 4 ohms each, what happens to the total resistance if one resistor is removed?

• No change

• Total resistance becomes zero

• Total resistance decreases

• Total resistance increases

What is the advantage of using parallel circuits in certain applications?

• Decreased voltage across components

• Increased resistance in the circuit

• Limited current flow through the circuit

• Independent functioning of components