Resistance in Circuits
This worksheet covers fundamental concepts of electrical resistance, Ohm's Law, series and parallel circuits, and factors affecting resistance for Grade 12 Physics students.
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Resistance in Circuits
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Read each question carefully and answer to the best of your ability. Show all work for calculation problems.
1. Which of the following statements best describes electrical resistance?
The rate at which charge flows through a circuit.
The opposition to the flow of electric current.
The potential energy difference between two points in a circuit.
The amount of power dissipated by a component.
2. According to Ohm's Law, if the voltage across a resistor is doubled, what happens to the current (assuming resistance remains constant)?
The current is halved.
The current is doubled.
The current remains the same.
The current is quadrupled.
3. The unit of electrical resistance is the , represented by the symbol Ω.
4. In a series circuit, the total resistance is the of individual resistances.
5. The resistance of a conductor is directly proportional to its and inversely proportional to its cross-sectional area.
6. Describe the difference between a series circuit and a parallel circuit in terms of current flow and voltage distribution across resistors.
7. Consider the series circuit shown below. Calculate the total equivalent resistance and the total current flowing through the circuit.
Given:
Voltage (V) = 12 V
Resistor 1 (R1) = 4 Ω
Resistor 2 (R2) = 6 Ω
8. Adding more resistors in parallel to a circuit decreases the total equivalent resistance.
True
False
9. A superconductor has zero electrical resistance at room temperature.
True
False
Match the term on the left with its definition on the right.
10. Ohm's Law
a. Property of a material that opposes the flow of electric current.
11. Resistance
b. V = IR
12. Resistivity
c. An intrinsic property of a material, independent of its dimensions.
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