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Electrical Theory

This page is designed to provide general electrical information. It should not be used as a substitute for obtaining advice from competent electricians, engineers and other appropriate professionals.

Electricity is complex and can seem mysterious at times. A basic understanding of the terms and their relationships can be useful in understanding how to sell, service and utilize generators. The explanations on these pages attempts to keep things as simple as possible.

How Generators Work

Circuit Breaker Guide

Electrical Terms

Ampere (Current): A unit of measurement for electric current flow.

Efficiency: The percentage of electrical output in relationship to the mechanical input of a system.

Power Factor (P.F.): The difference between the voltage and current waves zero. Normally this number is expressed as a decimal.

Real Power: Accounts for the current, voltage and power factor and is measured in kW.

Voltage: The pressure or electrical potential which causes current to flow in a conductor.

Watt: A common unit of measure for electrical power.

Electrical Formulas

Abbreviated Formulas
Voltage P.F. Calculate Amps Calculate Watts
120V 1-PH 1.0 Watts/120=Amps Amps*120=Watts
240V 1-PH 1.0 Watts/240=Amps Amps*240=Watts
208V 3-PH 1.0 Watts/360=Amps Amps*360=Watts
208V 3-PH 0.8 Watts/288=Amps Amps*288=Watts
240V 3-PH 1.0 Watts/415=Amps Amps*415=Watts
240V 3-PH 0.8 Watts/333=Amps Amps*333=Watts
480V 3-PH 1.0 Watts/831=Amps Amps*831=Watts
480V 3-PH 0.8 Watts/665=Amps Amps*665=Watts