Electricity Calculator - Calculator See


Electricity Calculator

Calculate electrical power (Watts), voltage (Volts), current (Amperes), and resistance (Ohms) using Ohm’s Law and Joule’s Law.

Calculator Inputs

V
Nominal electrical potential.
A
Electric current flow.
hrs
Average daily operating time.
$
Utility cost per kilowatt-hour.

Calculated Results

Calculated Electrical Power
1,800 Watts (1.80 kW)
Electrical Current 15.00 Amps
Supply Voltage 120.00 Volts
Circuit Resistance 8.00 Ohms (Ω)
Values calculate live as you adjust inputs.

About Electricity Calculator

Solves electrical relationships between Voltage (V), Current (I), Resistance (R), and Power (P) using Ohm’s Law (V = I * R) and calculates operating energy costs.

What is Electricity Calculator?

Solves electrical relationships between Voltage (V), Current (I), Resistance (R), and Power (P) using Ohm’s Law (V = I * R) and calculates operating energy costs.

How to Use This Calculator

  1. Enter voltage and circuit current.
  2. Specify daily operating hours and electric utility rate.
  3. Review wattage, resistance, and monthly operating cost.

The Mathematical Formula & Variables

Power (Watts) = Volts * Amps; Resistance = Volts / Amps; Monthly Cost = (Watts / 1000) * Hours/Day * 30 * Rate

Step-by-Step Worked Example

Scenario: 120V circuit drawing 15A running 4 hours daily at $0.16/kWh.

  1. Power = 120 V * 15 A = 1,800 Watts (1.80 kW).
  2. Resistance = 120 / 15 = 8.00 Ohms.
  3. Daily energy = 1.8 kW * 4 hrs = 7.2 kWh/day.
  4. Monthly cost = 7.2 * 30 * $0.16 = $34.56/month.

Result: Power: 1,800 W (Cost: $34.56/mo)

Frequently Asked Questions

What is the relationship between Watts and Horsepower?

1 Mechanical Horsepower equals exactly 745.7 Watts (0.746 kW).