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Voltage Calculator

Calculate electrical voltage (potential difference) from current and resistance or power and current.

1. Enter your numbers  →  2. Check the answer  →  3. Read the steps before you trust it

A
Ω

Calculated Voltage

Voltage (V)
120V
Power Dissipated
600W

Step-by-Step Engineering Calculation

  1. 1Formula: V=I×RV = I \times R
  2. 2V=5 A×24 Ω=120 VV = 5\text{ A} \times 24\ \Omega = \mathbf{120\text{ V}}
  3. 3Formula: P=I2×R=(5 A)2×24 Ω=600 WP = I^2 \times R = (5\text{ A})^2 \times 24\ \Omega = \mathbf{600\text{ W}}

Formula & Theory

V = I × R | V = P / I | V = √(P × R)

Computes electrical potential difference in Volts across an electrical load.

Variable Definitions
V:
Voltage (Volts (V)) – Electrical potential difference
I:
Current (Amperes (A)) – Circuit current
R:
Resistance (Ohms (Ω)) – Circuit resistance

Worked Engineering Example

Relay Coil Voltage

A relay coil with 150Ω resistance drawing 0.16A.

Inputs:
  • Current: 0.16 A
  • Resistance: 150 Ω
Result: Voltage = 24.00 V

Key Assumptions

  • •Steady-state DC or rms AC conditions.

Limitations & Safety Scope

  • •Does not include transient voltage spikes or inductive kickback.

Frequently Asked Questions

What is voltage?

Voltage is the electric potential difference per unit charge between two points in an electrical field.

Related Calculators & Engineering Tools

Ohm's Law Calculator
Voltage Drop Calculator

Educational & Reference Notice: This calculator provides technical estimates based on standard physical formulas. Actual electrical installation, protective device sizing, and conductor selection must be verified against the applicable electrical code (NEC, IEC, CEC) by a licensed electrician or qualified professional engineer.