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Electrical Resistance Worksheet
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Electrical Resistance Worksheet
📚 Part 1: Multiple Choice
1. What is electrical resistance?
The ability to conduct electricity
The opposition to the flow of electric current
The amount of current in a circuit
The voltage across a component
2. What is the unit of electrical resistance?
Amperes (A)
Volts (V)
Ohms (Ω)
Watts (W)
3. According to Ohm's Law, if voltage increases and resistance stays constant, current will:
Increase
Decrease
Stay the same
Become zero
4. Which factors affect the resistance of a wire? (Select all that apply)
Length of the wire
Cross-sectional area of the wire
Material of the wire
Colour of the wire
🧮 Part 2: Calculations
5. State Ohm's Law and write the formula for calculating resistance.
6. Calculate the resistance of a component if the voltage across it is 12V and the current through it is 3A. Show your working.
7. A resistor has a resistance of 50Ω and a current of 0.2A flows through it. Calculate the voltage across the resistor.
8. Complete the table using Ohm's Law:
Voltage (V) | Current (A) | Resistance (Ω)
6V | _____ | 3Ω
_____ | 0.5A | 20Ω
15V | 1.5A | _____
🔧 Part 3: Practical Applications
9. Draw the circuit symbol for a fixed resistor and a variable resistor in the space below:
10. Explain why the filament of a light bulb gets hot when current flows through it.
11. A student connects a 9V battery to a lamp. The lamp draws a current of 0.75A. If the connecting wires have negligible resistance, what is the resistance of the lamp? Show your calculation.
12. Suggest two practical applications where variable resistors might be used and explain why they are useful in each case.
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