Ohm's Law Calculations

A small desk lamp operates on a 12-volt battery. The circuit inside the lamp includes a resistor with a resistance of 4 ohms (Ω). What is the current (A) flowing through the circuit?

• 2 A

• 3 A

• 4 A

• 6 A

A hairdryer draws a current of 7 A while plugged into a 120 V outlet. What is the resistance (Ω) of the hairdryer’s electrical components?

• 10 Ω

• 15 Ω

• 17.14 Ω

• 20 Ω

A student designs a simple circuit with a 24-volt power supply connected to a motor that has a resistance of 8 ohms (Ω). How much current (A) is flowing through the circuit?

• 2 A

• 3 A

• 4 A

• 5 A

A refrigerator runs on a standard 120 V power supply and has a resistance of 30 Ω. Calculate the current (A) running through the refrigerator’s circuit.

• 2 A

• 3 A

• 4 A

• 5 A

A space heater requires 240 V to operate and draws a current of 10 A. What is the resistance (Ω) of the heater’s electrical system?

• 20 Ω

• 24 Ω

• 28 Ω

• 30 Ω

A laptop charger supplies 19 V to the laptop’s internal battery, and the charging circuit has a resistance of 3.8 Ω. How much current (A) is flowing through the charger?

• 4 A

• 5 A

• 6 A

• 7 A

An electric stove is plugged into a 240 V power source and has a resistance of 20 Ω. Calculate the current (A) flowing through the stove’s heating element.

• 10 A

• 12 A

• 14 A

• 16 A

A motorcycle’s electrical system is powered by a 12 V battery and requires a current of 4 A to operate. What is the resistance (Ω) of the motorcycle’s electrical system?

• 2 Ω

• 3 Ω

• 4 Ω

• 5 Ω

A large industrial fan operates on a 220 V power supply and has a resistance of 55 Ω. How much current (A) does the fan draw?

• 2 A

• 3 A

• 4 A

• 5 A

A car’s battery provides 480 V to the electric motor, which has a resistance of 120 Ω. What is the current (A) running through the motor?

• 2 A

• 3 A

• 4 A

• 5 A