Voltage is the electrical "push" in a wire or a battery, measured in units called volts. Think of electricity as water in a pipe: voltage is how hard the water is being pushed.

VoltageVoltage is the electrical "push"是電流裡的「推力」，in a wire or a battery存在於電線或電池裡，measured in units called volts用叫做「伏特」的單位來量。Think of electricity as water in a pipe把電想成水管裡的水：voltage電壓 is how hard the water is being pushed就是水被推得多用力。

Low voltage (a small battery, 1.5V) pushes gently. High voltage (a power line, thousands of volts) pushes hard enough to kill you. That is why you see it on warning signs: HIGH VOLTAGE.

Low voltage低電壓 (a small battery, 1.5V)（像小電池，1.5V） pushes gently推得很輕柔。High voltage高電壓 (a power line, thousands of volts)（像電力線，好幾千伏特） pushes hard enough to kill you推得夠用力，足以致命。That這 is why you see it on warning signs就是為什麼你會在警告標誌上看到它：HIGH VOLTAGEHIGH VOLTAGE（高壓）。

In everyday life you meet the word mostly on machines and travel plugs: Taiwan uses 110 volts, most of Europe uses 220, so people say "check the voltage before you plug it in" or "this hair dryer is dual voltage." It is normally uncountable — "the voltage is too high" — but engineers do say "different voltages" when they mean several different levels.

In everyday life在日常生活裡，you meet the word mostly on machines and travel plugs你大多會在機器和旅行用插頭上遇到這個詞：Taiwan uses 110 volts台灣用110伏特，most of Europe uses 220大部分歐洲用220伏特，so所以 people人們會說 say 'check the voltage before you plug it in'「插上去之前先檢查電壓」，or或 'this hair dryer is dual voltage.'「這台吹風機是雙電壓的」。It它 is normally uncountable通常是不可數名詞——'the voltage is too high'像「the voltage is too high」——but但 engineers工程師 do say確實會說 'different voltages'「different voltages」，when they mean several different levels指好幾種不同等級的時候。

There is also a loose, non-electrical use, though it is not common: people sometimes say a room or a performance has "high voltage" to mean it feels exciting and full of energy. That use is a bit dated now, and you will meet it more in writing than in speech.

There有 is also a loose, non-electrical use也有一種比較鬆散、跟電無關的用法，though it is not common不過不算常見：people人們 sometimes有時候 say a room or a performance has "high voltage"會說一個房間或一場表演「high voltage」，to mean it feels exciting and full of energy意思是感覺很刺激、充滿energy。That use這種用法 is a bit dated now現在有點過時了，and而且 you will meet it more in writing than in speech你在文章裡遇到的機會比在口語裡多。