varistor

varistor — noun

1. a circuit part whose resistance changes as voltage rises or falls, especially so

1.名詞C2
釋義

a circuit part whose resistance changes as voltage rises or falls, especially so it can protect equipment from sudden voltage spikes.

例句

Manuela added a varistor beside the power socket to catch voltage spikes.

varistor beside the power input

When lightning hit nearby, the varistor kept the printer from burning out.

varistor protects equipment from a surge

同義詞

文法句型

a varistor across the power input

replace the varistor on the board

the varistor clamps a surge

用法筆記

Usually mentioned in electronics, power-supply, and surge-protection contexts. It is often placed across an input line so it can soften a sudden voltage spike. Distinguish from a fuse: a fuse breaks the circuit after too much current, but a varistor mainly absorbs a spike in voltage.

常見錯誤

❌The fuse and the varistor are the same part.
✅The fuse and the varistor do different jobs.
💡A fuse opens the circuit, while a varistor mainly protects it from voltage spikes.
❌A varistor keeps the same resistance at every voltage.
✅A varistor changes its resistance when the voltage changes.
💡Its variable resistance is the key feature of the part.