What is Voltage? Definition of Voltage Explained

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Transcript

00:00It took me two and a half years to finally understand what voltage is.

00:04It's actually very simple.

00:06Imagine an electron as a basketball.

00:08When it's still on the ground, the potential energy of the ball is zero.

00:13When we throw the ball up, we need to act against gravity.

00:16When the ball flies into the air, it will gain potential energy.

00:20The potential energy difference between the ball and the ground

00:23will drive the basketball to automatically fall back to the ground.

00:27In the electric field, gravity has little effect.

00:30The potential difference that drives the electron flow

00:33is what we often call voltage.

00:36Just like a battery in a circuit,

00:38the positive and negative electrodes have different charges.

00:41The positive electrode has a high charge

00:44and the negative electrode has a low charge.

00:47When the circuit is not connected,

00:49the positive and negative charges in the battery attract each other

00:53and the electrons cannot move freely.

00:56But when connected with a wire,

00:58the negative electrode undergoes an oxidation reaction to produce electrons,

01:03just like a water tower releasing water,

01:06and the positive electrode undergoes a reduction reaction to absorb electrons,

01:11just like a steam pipe network absorbing water.

01:14The electrons will move freely through the wire,

01:17automatically running from the negative electrode to the positive electrode,

01:22and the potential difference between the two electrodes will gradually decrease.

01:27When the battery is exhausted, the electrons will stop moving.

01:31If we use a voltmeter at both ends of the battery,

01:34we can also measure the voltage.

01:36For example, if the positive voltage of the battery is 3.5 V

01:40and the negative voltage of the battery is 2 V,

01:44then the voltage of the battery is 1.5 V.

01:47If three batteries are connected in series,

01:50the voltage becomes 4.5 V.

01:53If the voltage is very small, you may only feel a little bit of a tingle,

01:57but if the voltage is very large, you may feel a stronger sensation.

02:01Like and follow for more informative videos.

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