Electrical Calculations and Formulas

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Summary: Basic electrical calculations of voltage drop and power factors help you understand the requirements for electrical projects and safe circuit wiring.

Electrical Calculations and Formulas Resource

Electrical Calculations and Formulas Voltage Drop Calculations Voltage drop is an essential factor in determining the correct wire size to prevent voltage loss which will occur in long distance runs of electrical wire or cable. Electrical Power Calculations Electrical power calculations are required to determine the initial load requirement for any given circuit. Power Factors are identified and taken into consideration as well to maintain safety for circuit integrity and performance.

Voltage Drop Calculations

Electrical Power Calculators

*Disclaimer
Other electrical projects will require extensive consideration when it comes to voltage drop due to the length of the electric service or generator sizing especially when motors will be used, such as well pumps.

To assist you in the planning process I have selected a few resources to help you in the calculation process that I find very helpful.

Voltage Drop Calculations
The following calculators will help determine the minimum size conductor needed based on a 3% Voltage Drop. It does not take into consideration other factors such as minimum ampacity based on the National Electric Code Table 310-16.

Voltage Drop Calculator#1

Voltage Drop Calculator#2

Electrical Power Calculators
Calculators to help you determine the size of generator required for your specific application.  Other calculators for unit conversions and other power related calculations.

Power Calculators

Disclaimer
* Ask-The-Electrician takes no responsibility for any false or misleading information. The use of these calculators are the responsibility of the user only. The results produced by these calculators are not guaranteed to be correct or applicable in all situations.The user must also understand the Electrical Code may or may not be legally acceptable in their area and may be modified or superceded by the locality in which the work is installed.

More Electrical Calculations and Formulas:

Ohms Law Formula Electrical Projects Guidelines