Electrical Circuits Quiz

Calculate the current flowing through a resistor of 10 ohms when a voltage of 5V is applied across it.

• 0.5 A

• 1 A

• 2 A

• 5 A

A circuit has a current of 2A flowing through a resistor of 15 ohms. The voltage across the resistor is (a)  

• 30V
• 20V
• 10V
• 5V

If a resistor has a resistance of 25 ohms and the voltage across it is 50V, what is the current flowing through the resistor?

• 1 A

• 2 A

• 0.5 A

• 4 A

Calculate the power dissipated by a resistor of 20 ohms when a current of 3A flows through it.

• 60 watts

• 120 watts

• 180 watts

• 240 watts

A device operates at 12V and draws a current of 1.5A. What is the power consumption of the device?

• 18W

• 20W

• 24W

• 30W

A resistor dissipates 100W of power and the current flowing through it is 5A. The resistance of the resistor is (a)   .

• 2 ohms
• 4 ohms
• 5 ohms
• 10 ohms

A resistor of 30 ohms has a voltage of 90V across it. Calculate the current and the power dissipated by the resistor.

• Current: 3A, Power: 270W

• Current: 2A, Power: 180W

• Current: 1A, Power: 90W

• Current: 4A, Power: 360W

Match the following electrical parameters with their correct values for a 60W light bulb operating at 120V.

• Current: 0.5 A, Resistance: ?

• 0.5 A, 144 Ω

• Current: 0.6 A, Resistance: ?

• 0.6 A, 240 Ω

• Current: ?, Resistance: 144 Ω

• 0.5 A, 240 Ω

• Current: ?, Resistance: 240 Ω

• 0.6 A, 200 Ω

If a heater has a resistance of 50 ohms and operates at 240V, what is the current flowing through it and the power it consumes?

• Current: 4.8A, Power: 1152W

• Current: 5.0A, Power: 1200W

• Current: 4.5A, Power: 1080W

• Current: 4.0A, Power: 960W

Calculate the voltage drop in a 150m long circuit using a 10mm² copper cable (resistivity of copper is (1.72x10⁻⁸)) carrying a load of 60A.

• 1.55V

• 2.07V

• 3.10V

• 4.65V