Transient voltage is a slowly building pulse of current or voltage in an electrical circuit.

• A. True
• B. False
• C. A rapidly changing pulse
• D. A steady DC level

Answer: (B)

Transient voltage is a brief, abrupt change in voltage or current that happens when a circuit is switched, experiences a fault, or is disturbed by an external event. It is not a slowly building pulse; a slow ramp or gradual change describes something else, not a transient. Transients rise quickly and last only a short time—often microseconds to milliseconds—showing up as spikes or short bursts above or below the normal level. This sudden nature is why protection components like surge suppressors or TVS diodes are used, to clamp or dampen those brief spikes. If you picture a slowly increasing signal, that’s not what a transient is; transients are all about rapid, brief changes.