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Quizzes > High School Quizzes > Science

Ohm's Law Practice Quiz Questions

Sharpen your skills with worksheets and answers

Difficulty: Moderate
Grade: Grade 10
Study OutcomesCheat Sheet
Colorful paper art representing a trivia quiz on Ohms Law for high school physics students.

Which equation represents Ohm's Law?
V = I Ã - R
V = R / I
V = I + R
V = I / R
Ohm's Law states that the voltage across a resistor equals the product of the current and the resistance. This fundamental relationship is essential for analyzing electrical circuits.
What is the unit of resistance?
Watt
Ampere
Ohm
Volt
Resistance is measured in ohms (Ω), which quantifies how much a component opposes the flow of electric current. This unit is derived from the relationship between voltage and current.
If a circuit has a voltage of 10 V and a resistance of 5 Ω, what is the current?
5 A
50 A
10 A
2 A
Using Ohm's Law (I = V/R), the current is computed as 10 V divided by 5 Ω, which equals 2 A. This simple calculation reinforces the fundamental relationship between voltage, current, and resistance.
Which instrument is used to measure electric current?
Thermometer
Ohmmeter
Voltmeter
Ammeter
An ammeter is specifically designed to measure the flow of electric current in a circuit. It is an essential tool for diagnosing and understanding electrical circuits.
In the equation V = IR, what does the symbol I represent?
Resistance
Voltage
Power
Current
In Ohm's Law, I stands for current, which is the flow of electric charge through the circuit. Understanding this notation is key to applying the law correctly.
How does doubling the resistance affect the current if the voltage remains constant?
The current is halved
The current becomes zero
The current remains unchanged
The current doubles
According to Ohm's Law (I = V/R), if the resistance doubles while the voltage is constant, the current is halved. This demonstrates the inverse relationship between current and resistance.
What happens to the total resistance when resistors are connected in series?
It becomes zero
It increases as the resistances add up
It remains unchanged
It decreases
In a series circuit, the total resistance is the sum of the individual resistances. This means that adding more resistors in series will always increase the overall resistance.
Calculate the current in a circuit with a 24 V supply and two 4 Ω resistors connected in parallel.
12 A
8 A
6 A
16 A
For two resistors in parallel, the equivalent resistance is given by 1/R_eq = 1/4 + 1/4 = 1/2, so R_eq is 2 Ω. Using Ohm's Law, the current is calculated as 24 V / 2 Ω = 12 A.
In a circuit with a constant voltage supply, what is the effect of increasing the resistance on the current?
The resistance does not affect the current
The current decreases
The current increases
The current remains constant
With a constant voltage, Ohm's Law (I = V/R) dictates that increasing the resistance will lower the current. This inverse relationship is a cornerstone concept in circuit analysis.
What is the unit for measuring electric current?
Watt
Ohm
Volt
Ampere
Electric current is measured in amperes (A), which quantifies the flow of electric charge. This unit is fundamental in the field of electrical engineering.
An appliance draws a current of 3 A when connected to a 120 V supply. What is its resistance?
360 Ω
0.025 Ω
400 Ω
40 Ω
Using the formula R = V/I, the resistance is calculated as 120 V divided by 3 A, which equals 40 Ω. This problem reinforces the practical application of Ohm's Law.
When resistors are connected in parallel, how does the overall resistance compare to the smallest individual resistor?
It is greater than the largest resistor
It is always less than the smallest resistor
It is equal to the smallest resistor
It is the average of all resistances
For resistors in parallel, the equivalent resistance is always lower than the resistance of any single resistor in the network. This is due to the multiple pathways available for current to flow.
In a circuit with a constant voltage, if the resistance is increased, what happens to the power dissipated by the resistor?
The power decreases
The power increases
The power remains constant
Power is independent of resistance
With a constant voltage supply, power can be expressed as P = V²/R. Therefore, if resistance increases, the power dissipated by the resistor decreases. This illustrates how resistance affects energy consumption in a circuit.
Which graph best represents Ohm's Law for a resistor?
A linear graph passing through the origin
A parabolic graph
An exponential graph
A logarithmic graph
Ohm's Law shows a direct, linear relationship between voltage and current. This relationship is graphically represented by a straight line that passes through the origin, indicating proportionality.
In a circuit, if the battery voltage is 9 V and the total resistance is 3 Ω, what is the current?
1 A
6 A
3 A
9 A
Applying Ohm's Law (I = V/R), the current in the circuit is calculated as 9 V divided by 3 Ω, which equals 3 A. This basic calculation reinforces the direct application of the formula.
A resistor's resistance can change with temperature. How does an increase in temperature typically affect the resistance of a metal resistor?
It increases
It decreases
It remains constant
It fluctuates unpredictably
Metal resistors usually have a positive temperature coefficient, meaning their resistance increases as temperature rises. This behavior is important for understanding performance changes in real-world circuits.
Calculate the equivalent resistance for a combination where three 6 Ω resistors are connected in series and then paralleled with a single 6 Ω resistor.
4.5 Ω
7.5 Ω
5 Ω
6 Ω
First, the three 6 Ω resistors in series add up to 18 Ω. When this series combination is placed in parallel with a 6 Ω resistor, the overall resistance is calculated using the parallel formula, yielding an equivalent resistance of 4.5 Ω.
In an experiment, a measured current is lower than predicted by Ohm's Law. Which factor could explain this discrepancy?
An increase in battery voltage
A decrease in resistor value
Additional resistance from wiring and connections
Measurement error due to overestimated current
Real-world circuits often have extra resistances from wires, contacts, and the internal resistance of power sources. These factors can result in a lower measured current than the ideal prediction from Ohm's Law.
How is electrical power related to voltage and current, and how can Ohm's Law be used to express power in different forms?
P = V/I, which then becomes R/I
P = V + I, independent of resistance
P = I/V, which cannot be expressed using Ohm's Law
P = VI, which can also be written as I²R or V²/R using Ohm's Law
Electrical power is defined as P = VI. By substituting Ohm's Law (I = V/R) into this equation, it can be rearranged to P = V²/R, and similarly, using I = V/R leads to P = I²R. This shows the versatile ways power can be calculated.
Non-ohmic conductors do not obey Ohm's Law. What characterizes the behavior of a non-ohmic conductor?
It has a constant resistance regardless of applied voltage
It behaves exactly like an ideal resistor
Its resistance changes with voltage and current
It only allows current to flow in one direction
Non-ohmic conductors exhibit a variable resistance that changes with factors such as voltage, current, or temperature. This means the voltage-to-current ratio is not constant, which distinguishes them from ohmic conductors.
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Study Outcomes

  1. Apply Ohm's Law to calculate voltage, current, and resistance in various circuit scenarios.
  2. Analyze electrical circuits to determine how component changes affect overall performance.
  3. Interpret practice quiz questions to identify and correct common problem-solving errors.
  4. Evaluate the relationship between voltage, current, and resistance in series and parallel circuits.
  5. Utilize interactive questions to simulate real exam conditions and enhance analytical skills.

Ohm's Law Quiz & Questions Cheat Sheet

  1. Understand Ohm's Law - Ohm's Law explains how voltage, current, and resistance work together in a circuit, summed up by V = I × R. Mastering this fundamental relationship is like unlocking the secret code of electricity! Ohm's Law Tutorial
  2. Rearrange the Formula - Learning to solve for any variable (I = V ÷ R or R = V ÷ I) makes you a circuit ninja, flipping equations at will. Practice switching V, I, and R around to build confidence and speed. Ohm's Law Examples
  3. Practice with Real-World Examples - Dive into everyday scenarios to calculate current, voltage, and resistance like a true problem-solver. The more you apply Ohm's Law to real gadgets, the more it clicks in your brain! Word Problems Practice
  4. Explore Power Relationships - Understand how power (P) ties into voltage and current with P = V × I, and see how energy really flows in your circuit. This step turns you from a law learner into a power pro! Ohm's Law & Power Worksheet
  5. Series and Parallel Circuits - Apply Ohm's Law to series and parallel setups to find equivalent resistance and current distribution. Visualizing how resistors share voltage and current will make complex circuits feel like child's play. Series & Parallel Examples
  6. Get Comfortable with Units - Volts (V), amperes (A), and ohms (Ω) are your new best friends. Knowing units inside out helps you catch mistakes and impress your study buddies! Ohm's Law Units Worksheet
  7. Use the Ohm's Law Triangle - Place V at the top, and I and R at the bottom corners of your triangle to quickly recall formulas under pressure. This handy mnemonic is like a cheat code for exams! Ohm's Law Triangle
  8. Work Through Word Problems - Tackling story-based questions makes your understanding durable and exam-ready. Turn confusing text into clear circuits by identifying knowns and unknowns step by step. More Word Problems
  9. Master Electrical Power Formulas - Learn P = I² × R and P = V² ÷ R to calculate how much energy is converted to heat or light. Power formulas tie back beautifully to Ohm's Law and deepen your circuit insights. Power & Ohm's Law
  10. Test Yourself with Quizzes - Interactive quizzes and flashcards boost retention and make review sessions fun. Challenge yourself daily to see how quickly you can solve Ohm's Law puzzles! Ohm's Law Flashcards
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