Ohm’s law equation

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Ohm's law equation
Ohm’s law equation | Image: Learnool

The Ohm’s law equation, V = I × R, mathematically expresses the relationship between voltage (V), current (I), and resistance (R). This equation demonstrates that the voltage across a conductor is directly proportional to the product of the current flowing through it and the resistance it possesses.

Practice problems

Problem #1

Calculate the current flowing through an electronic device with a resistance of 4 Ω and a voltage of 8 V.

Solution

Given data:

  • Current, I = ?
  • Resistance, R = 4 Ω
  • Voltage, V = 8 V

Applying the formula:

  • V = I × R
  • 8 = I × 4
  • I = 2 A

Therefore, the current flowing through an electronic device is 2 A.

Problem #2

A 5 A current is flowing through a 15 Ω resistor. Determine the voltage across the resistor.

Solution

Given data:

  • Current, I = 5 A
  • Resistance, R = 15 Ω
  • Voltage, V = ?

Applying the formula:

  • V = I × R
  • V = 5 × 15
  • V = 75 V

Therefore, the voltage across a resistor is 75 V.

Problem #3

An electric circuit has a voltage of 5 V and a current of 10 A. Calculate the resistance of an electric circuit.

Solution

Given data:

  • Voltage, V = 5 V
  • Current, I = 10 A
  • Resistance, R = ?

Applying the formula:

  • V = I × R
  • 5 = 10 × R
  • R = 0.5 Ω

Therefore, the resistance of an electric circuit is 0.5 Ω.

Problem #4

What is the electric current flowing through a 12 Ω resistor with a voltage of 60 V?

Solution

Given data:

  • Current, I = ?
  • Resistance, R = 12 Ω
  • Voltage, V = 60 V

Applying the formula:

  • V = I × R
  • 60 = I × 12
  • I = 5 A

Therefore, the electric current flowing through a resistor is 5 A.

Related

External links

Deep

Learnool.com was founded by Deep Rana, who is a mechanical engineer by profession and a blogger by passion. He has a good conceptual knowledge on different educational topics and he provides the same on this website. He loves to learn something new everyday and believes that the best utilization of free time is developing a new skill.

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