Voltage｜Glossary

This page is part of the Electrical Glossary for RF and coaxial systems.

Voltage is the electrical potential difference that drives electric charge through a circuit. It represents the energy required to move a unit charge and is measured in volts (V).

By definition, 1 volt is the potential difference that moves 1 coulomb of charge with 1 joule of energy (1 V = 1 J/C). In circuits, voltage and current are related by Ohm’s law (V = I × R).

DC voltage remains constant over time, while AC voltage varies periodically. For AC systems, the root mean square (RMS) value is commonly used to represent effective voltage.

At higher voltages, insulation, clearance, and creepage distance become critical design factors. Voltage performance is also affected by insulation materials and environmental conditions such as temperature and altitude.

Common measurement tools include digital multimeters, and for high-frequency applications, oscilloscopes and spectrum analyzers are used.

In RF and coaxial systems, voltage is closely related to insulation performance, signal integrity, and breakdown risk.

High voltage levels can cause dielectric breakdown within connectors and cables if insulation limits are exceeded. This makes voltage rating and withstand voltage critical parameters when selecting RF components.

At high frequencies, voltage distribution along transmission lines must also be considered, as impedance mismatches can lead to reflections and localized voltage peaks.

Proper design requires evaluating voltage together with impedance, frequency, and environmental conditions. Ensuring adequate insulation and spacing helps maintain stable performance and prevents failure in RF systems.