Grade 9 Circuit Calculations Worksheet
A worksheet for Grade 9 science students to practice calculating current, voltage, and resistance in series and parallel circuits.
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Grade 9 Circuit Calculations
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Read each question carefully and show all your work. Use the formulas: V = IR (Ohm's Law), Series Resistance: R_total = R1 + R2 + ..., Parallel Resistance: 1/R_total = 1/R1 + 1/R2 + ...
1. Which of the following best describes the relationship between voltage, current, and resistance?
Voltage is directly proportional to current and inversely proportional to resistance.
Current is directly proportional to voltage and inversely proportional to resistance.
Resistance is directly proportional to voltage and current.
All of the above.
2. In a series circuit with three resistors (R1, R2, R3), how is the total resistance calculated?
R_total = R1 * R2 * R3
R_total = (R1 + R2 + R3) / 3
R_total = R1 + R2 + R3
1/R_total = 1/R1 + 1/R2 + 1/R3
3. The unit of electrical current is the .
4. In a parallel circuit, the voltage across each branch is .
5. A series circuit has a voltage source of 12V and three resistors with resistances of 2Ω, 4Ω, and 6Ω. Calculate the total resistance of the circuit and the current flowing through it.
6. A parallel circuit has a 12V battery and two resistors, 3Ω and 6Ω, connected in parallel. Calculate the total resistance of the circuit and the total current drawn from the battery.
7. Adding more resistors in series decreases the total resistance of the circuit.
True
False