GCSE Electricity: Ohms Law Calculations

Subject: Physics

Level: Intermediate

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Instructions:

This test contains 10 multiple-choice questions on the topic of Electricity taught at GCSE level.

Each question has a set of answer choices. Choose the best answer for each question.

If you would like to read more about the topic please read our study notes online.

Q1.

An electric heater draws a current of 10A when connected to a 240V mains supply. Calculate the resistance of the heating element.

1. 24 Ω
2. 2.4 Ω
3. 2400 Ω
4. 0.042 Ω

Q2.

A small heating element designed for a model train has a resistance of 3 ohms. It is connected to a 3-volt battery.

What is the current flowing through the heating element, in Amperes?

**Fig:** A model train with a small electric heating element

1. 9 A
2. 0.33 A
3. 1 A
4. 0.1 A

Q3.

A light bulb has a current of 0.2 amperes flowing through it. If the resistance of the bulb's filament is 600 ohms, what is the voltage drop across the bulb?

1. 3 volts
2. 3000 volts
3. 120 volts
4. 0.0003 volts

Q4.

A resistor with a resistance of 100 ohms has a current of 0.5 amperes flowing through it. What is the voltage drop across the resistor?

1. 200 volts
2. 50 volts
3. 0.005 volts
4. 2 volts

Q5.

A LED (Light Emitting Diode) is connected to a 3V power supply. If the current flowing through the LED is 20mA (0.02A), what is the resistance of the LED?

**Fig:** An LED connected to a +3V DC supply drawing 20 mA

1. 15 Ω
2. 0.0067 Ω
3. 60 Ω
4. 150 Ω

Q6.

A small DC motor has a resistance of 20 ohms and is connected to a 6-volt battery. What is the current flowing through the motor?

**Fig:** A small DC motor with a resistance of 20 ohms is powered by a +6-volt supply

1. 6.7 A
2. 0.3 A
3. 3 A
4. 120 A

Q7.

A light bulb is connected to a 12V battery. As shown in the circuit diagram below, the current flowing through the bulb is 0.5A.

Calculate the resistance (R1) of the bulb filament.

**Fig:** Filament bulb drawing 0.5A of current with 12V supply

1. 6 Ω
2. 24 Ω
3. 0.042 Ω
4. 12.5 Ω

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