varistor

varistor — 名詞

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

1.名詞C2
釋義

壓敏電阻

阻值會隨電壓改變的電阻

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.

Manuela 把壓敏電阻加在電源插座旁邊，用來擋住突波。

varistor beside the power input

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

附近遭雷擊時，壓敏電阻讓印表機沒有燒壞。

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.