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The **Electrician's Calculator** has useful equations for electricity and wiring. These include Voltage Drop equations, Electrical Cost equations, and equations for the relationships between **potential (voltage), current, resistance **and** power** (aka Ohm's Law). Checkout the new Electricians Labor Estimates Calculator!

The Electrician's Calculator has a tab for General functions. These include:

**Voltage Drop**calculates the drop in volts over a line based on key measurements including distance, gauge, current, temperature and materials. (e.g. 8.92 volts reduction)**Voltage Drop %**which calculates the voltage drop as a percent of voltage. (e.g. 13.2% voltage reduction)**Wire Gauge Choice**computes the lightest gauge of wire to limit the voltage drop over the distance. (e.g. Gauge: 12 Drops: 9.2%) VIDEO INSTRUCTION**Electricity Cost**estimates the cost of running an electrical appliance based on key measurements. Note: A recent survey indicated that the average rate for a kiloWatt-hour in the United States was 11.88 cent per kWh (2012) (e.g. $4.25)**Rolling Offset**computes the travel (T) and run (R) of a rolling offset used in conduit piping based on the offsets and angles. VIDEO INSTRUCTION

Ohm's Law established relations between **potential (voltage), current, resistance **and** power**.

**Compute Electrical Power:** (watts, milliwatts, kilowatts, horsepower)

**Power (P) = I • V**: computes the power (watts) as a function of current (amps) and potential (volts).**Power (P) = R • I²**: computes the power (watts) as a function of current (amps) and resistance (ohms).**Power (P) = V² / R**: computes the power (watts) as a function of potential (volts) and resistance (ohms).

**Compute Electrical Potential:** (volts, millivolts)

**Volts (V) = I • R**: computes the potential (volts) as a function of current (amps) and resistance (ohms).**Volts (V) = P / I**: computes the potential (volts) as a function of power (watts) and current (amps).**Volts(V) = √(P • R)**: computes the potential (volts) as a function of power (watts) and resistance (ohms).

**Compute Electrical Resistance:** (ohms, milliohms, kiloohms)

**Resistance (R) = V²/P**: computes the resistance (ohms) as a function of potential (volts) and power (watts).**Resistance (R) = P / I²**: computes the resistance (ohms) as a function of power (watts) and current (amps).**Resistance (R) = V / I**: computes the resistance (ohms) as a function of potential (volts) and current (amps).

**Compute Electrical Current: **(amps, milliamps, microamps, gilberts)

**Current (I) = V / R**: computes the current (amps) as a function of potential (volts) and resistance (ohms).**Current (I) = P / V**: computes the current (amps) as a function of the power (watts) and the potential (volts).**Current (I) = √(P/R)**: computes the current (amps) as a function of the power (watts) and the resistance (ohms).

Feel free to update this section with advice, data and references for people using these equations.