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Understanding Ohm's Law

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Questions and Answers

If a circuit has a voltage of 9 V and a resistance of 3 Ω, what is the current flowing through the circuit?

2 A (correct)

27 A

3 A

0.5 A

Which of the following relationships holds true according to Ohm's Law?

Voltage is independent of resistance

Resistance is inversely proportional to voltage

Current is directly proportional to voltage when resistance is constant (correct)

Increasing voltage decreases current

A load has a resistance of 50 Ω and experiences a current of 4 A. What is the voltage across the load?

0.08 V

50 V

12 V

200 V (correct)

If you have a circuit where the voltage is halved while the resistance remains unchanged, what happens to the current?

<p>The current is halved</p> Signup and view all the answers

A circuit has a current of 2 A and a voltage of 6 V. What is the resistance in the circuit?

<p>3 Ω</p> Signup and view all the answers

Study Notes

Ohm's Law

Ohm's Law describes the relationship between voltage, current, and resistance.
The formula is: V = IR
- V = Voltage (measured in volts)
- I = Current (measured in amps)
- R = Resistance (measured in ohms)
Other formula arrangements:
- I = V/R
- R = V/I

Sample Problem 1

A load has 1.2 A of current and a voltage of 6.0 V.
Calculate the resistance.
- Use the formula R = V/I
- R = 6.0 V / 1.2 A = 5.0 Ω

Sample Problem 2

A 110 Ω resistor is connected to a 12 V power supply.
Calculate the current.
- Use the formula I = V/R
- I = 12 V / 110 Ω = 0.11 A

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Description

This quiz covers Ohm's Law, which explains the relationship between voltage, current, and resistance. Participants will apply the formulas to solve sample problems and reinforce their understanding of these fundamental electrical concepts.