OHELE reference layer
Electrical Engineering Glossary
A concise entry point for the terms that recur across OHELE guides. Each definition links to a fuller explanation with applications, safety boundaries and related equipment.
What Is Voltage? Electric Potential Difference Explained With Examples
Voltage is electric potential difference between two points. It describes how much electrical potential energy is available per unit of charge to move between…
How Does a Transformer Work? Core, Windings and the EMF Equation in Plain Terms
A transformer transfers electrical energy between two windings through a changing magnetic field. An alternating voltage applied to the primary winding produces an alternating…
Difference Between MCB, MCCB, ELCB, RCD & RCBO Breakers
The five names are usually listed as if they were five points on one scale. They are not. They answer two different questions, and…
How to Use a Multimeter: Voltage, Current, Resistance and Continuity
The first decision when using a multimeter is not which button to press. It is whether the meter, leads, probes, and selected function are…
Transmission vs Distribution: How Electricity Reaches Your Building
Transmission carries bulk electricity between generation and major network nodes. Distribution delivers it through local networks to customers. Voltage is an important clue, but…