Enter the supply voltage, current, and resistance into the calculator to determine the voltage drop across a resistor.

Voltage Drop Formula

The following formula is used to calculate the voltage drop across a resistor.

V_{drop} = I * R

Variables:

  • Vdrop is the voltage drop across the resistor (V)
  • I is the current flowing through the resistor (A)
  • R is the resistance of the resistor (Ω)

To calculate the voltage drop across a resistor, multiply the current flowing through the resistor by the resistance of the resistor.

What is a Voltage Drop?

Voltage drop refers to the reduction in voltage across a component in an electrical circuit. It occurs when current flows through a resistive element, such as a resistor, and is an important consideration in circuit design to ensure that each component receives the appropriate voltage.

How to Calculate Voltage Drop?

The following steps outline how to calculate the voltage drop across a resistor.

  1. First, determine the current (I) flowing through the resistor in amperes (A).
  2. Next, determine the resistance (R) of the resistor in ohms (Ω).
  3. Use the formula Vdrop = I * R to calculate the voltage drop (Vdrop).
  4. Finally, enter the values into the calculator to verify the voltage drop across the resistor.

Example Problem :

Use the following variables as an example problem to test your knowledge.

Current (I) = 2 A

Resistance (R) = 10 Ω