So, this concept of voltage,

voltage is called the potential difference between two points in the circuit.

So, what this means, potential difference is, think of voltage as the pressure.

So, voltage is just like the pressure in the water system.

That pump provides pressure on the water that you can measure with, say,

a pressure gauge, right?

But note that, pressure is what actually pushes the water through.

So voltage, that battery in our picture is actually providing some voltage.

Providing essentially the pressure on the carriers on the electrons to

push them through the circuit.

So, think of voltage like that.

Now note that, pressure difference is what counts.

So, what I mean is.

There's pressure but current only flows if there's a difference in voltage.

Like in water.

It's like water.

Just start with water.

Let's say, you got a pipe.

There's two ends of the pipe, right.

Water flowing through, but there's two ends of the pipe.

And both of them,

there's a high pressure you put, it's a powerful pump on one end, right?

So, the high pressure there.

You put a powerful pump on the other end, same pressure.

So, there's high pressure on the other end.

How much current is flowing?

If they're equal pumps with equal pressure, then there's no current flowing,

even though, you've got high pressure on one end, high pressure on the other.

The pressure different between the two end points of the pipe,

there's no difference in their pressure.

So, there's no flaw.

So, even though, there's high pressure, the pressure difference is what counts.

And voltage is the same way.

There has to be a difference in voltage, and that's a different thing.

That you put that out, what they call potential difference,

difference in Potential.

So, between the positive and negative terminals of the battery,

you have a potential difference of whatever amount of voltage the battery is.

So say, that battery is rated at five volts, then that means, there's five volts

potential difference between the positive and negative terminals.

Which means, that if you wire those two together,

current will flow from the positive to the negative.