Electrical Circuits Quiz

What is the unit of electrical resistance?

• Ohm

• Watt

• Ampere

• Volt

Ohm's law states that current is directly proportional to what other quantity?

• Voltage

• Power

• Resistance

• Frequency

In Ohm's law, if the voltage remains constant, how does the current change with increasing resistance?

• Current increases

• Current decreases

• Current remains the same

• Current is inversely proportional to resistance

What is the unit of electric current?

• Ohm

• Volt

• Ampere

• Watt

If a circuit has a resistance of 10 ohms and a voltage of 20 volts, what is the current flowing through it?

• 20 A

• 10 A

• 0.5 A

• 200 A

If the voltage across a resistor is 12 V, and the current flowing through it is 3 A, what is the resistance?

• 4 ohms

• 36 ohms

• 15 ohms

• 9 ohms

What is the formula for calculating electrical power in a circuit?

• P = V/I

• P = IV

• P = R/I

• P = V/R

A 60-watt light bulb operates at a voltage of 120 V. What is the current flowing through it?

• 0.5 A

• 2 A

• 60 A

• 120 A

If you have a circuit with a current of 2 A and a voltage of 6 V, what is the power consumed by the circuit?

• 3 W

• 12 W

• 2 W

• 4 W

If you double the voltage across a resistor while keeping the resistance constant, what happens to the current?

• It doubles

• It halves

• It remains the same

• It decreases by 25%