Volt
lastmod 2025-11-05created 2020-09-226 edits
The volt (Italian/English: volt, symbol: V) is the SI derived unit for electric potential difference, i.e., voltage, and is derived from the ampere and the watt. It is named after Alessandro Volta, who invented the first chemical battery in 1800.
Simple brief
A high voltage (V) is the same concept as high pressure. Voltage has the property of flowing from high to low. When charging a battery, it only charges if you use a charger with a higher voltage than the battery's; if you use a charger with a lower voltage, it will not fully charge.
Volt/Ampere/Watt relationship
Volt
Vaw-01.jpg
- For example, here are 3 waterfalls with different widths and heights.
- Waterfall 2, which is wider, has more force than waterfall 1 of the same height. (difference in A)
- Between waterfalls 2 and 3, which have the same width, waterfall 3, which is higher, has more force. (difference in V)
Ampere
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- Filling a 100-liter water tank through a 1 cm diameter pipe at a pressure (V) of 10 (①) takes 10 seconds.
- Increasing the pressure (V) to 20 would take 5 seconds, and widening the diameter to 2 cm also takes 5 seconds (②).
- When filling the same amount of water in the same time, pressure (V) and diameter (A) are inversely proportional.
- On the other hand, if the goal is simply to fill it as fast as possible regardless of time, you would raise both the pressure and the diameter. (③)
Watt
Vaw-equation.gif
Categories
See also
- Adapter
- Electrical cable
- P: Korean: 전력 (Korean: 와트, W, Watt)
- V: Korean: 전압 (Korean: 볼트, V, Volt)
- I: Korean: 전류 (Korean: 암페어, A, Ampere)