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Ohm's Law Calculations
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Ohm's Law Calculations
📚 Part 1: Multiple Choice
1. What is the unit of electrical resistance?
Amperes (A)
Volts (V)
Ohms (Ω)
Watts (W)
2. According to Ohm's Law, if voltage increases and resistance stays the same, what happens to current?
Current decreases
Current increases
Current stays the same
Current becomes zero
3. Which of the following are functions of resistors in circuits? (Select all that apply)
Control current flow
Protect circuits from damage
Generate electricity
Transfer electrical energy to heat
🧮 Part 2: Ohm's Law Calculations
4. Calculate the voltage across a resistor when the current is 2A and the resistance is 5Ω.
Formula: V = IR
Answer: V = _______ volts
5. A circuit has a voltage of 12V and a current of 3A. Calculate the resistance.
Formula: R = V/I
Answer: R = _______ ohms
6. What current flows through a 10Ω resistor when connected to a 6V battery?
Formula: I = V/R
Answer: I = _______ amperes
7. A resistor has a voltage of 9V across it and a current of 1.5A flowing through it. What is its resistance?
Answer: R = _______ ohms
✏️ Part 3: Short Answer Questions
8. Define electrical resistance in your own words.
9. Explain what happens to the current in a circuit if the resistance is doubled whilst the voltage remains constant.
10. Give two examples of household appliances that use resistors and explain why resistors are needed in each case.
11. A student measures the voltage across a resistor as 8V and the current as 4A. If the voltage is increased to 12V, predict the new current value. Show your working.
Predicted current: _______ amperes
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