As most of you know, potential difference is the work needed to move one electrical charge from one point to another.
Thanks.
As most of you know, potential difference is the work needed to move one electrical charge from one point to another.
Is there anything wrong with using the exact same definition, but use the word energy instead of work? To my knowledge they are used interchangeably, and both use the same unit which joule.
It is just that work is the energy expended to perform something.
Reason I'm asking(I'm debating with someone)
Thanks.
Where have you read potential difference defined as that.
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Potential difference is not work, and is not exclusive to electronics or electricity. It a elementary physics term used to describe the degree of "opportunity" for stored energy to be "released".
Other forms of stored energy can be measured in terms of potential, like heat, air, and fluid pressure. Even an apple dangling from a tree is described as having potential. Where the word difference comes in is when the potential of the stored energy is measured vs. another state of potential (or lack thereof). We also use the greek word DELTA in those terms. As in temperature PT being DeltaT.
So, as in temperature, when a hot baked good is brought out of the oven at 100 deg C, into an ambient environment of perhaps 22 deg C, we say the DeltaT (or PT) is 78 deg C. This is because we know that an exchange of that energy will occur, with heat being the ENERGY, and the nature of heat being to flow from warm to cool. So the faster moving molecules that are heated will collide with cooler, slower molecules and eventually the energy will be dissapated to near ambient.
If a balloon is filled to a pressure of 20 psia (lbs/sq inch atmospheric) vs 14 lbs of atmospheric pressure in the environment, there is 6 lbs of potential or DeltaP of 6 psig (lbs/sq inch gauge), with atmospheric referred to as 0 psig.
Energy is not potential but can be described in terms of it when it is stored. But energy is not stored when it is doing work, so it is obvious that it can't be called potential, The two are related but not the same.
Energy and work are not completely identical even though they use the same unit of measure.Shooooot! I actually meant to say the electric potential difference, not just the potential difference. Sorry I thought it was clear since It was posted here.
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Back to my original question, do you see now what I meant by it?
Energy and work are not completely identical even though they use the same unit of measure.
From Work, Energy and Power
Work refers to an activity involving a force and movement in the directon of the force. A force of 20 newtons pushing an object 5 meters in the direction of the force does 100 joules of work.
Energy is the capacity for doing work. You must have energy to accomplish work - it is like the "currency" for performing work. To do 100 joules of work, you must expend 100 joules of energy.
Shooooot! I actually meant to say the electric potential difference, not just the potential difference. Sorry I thought it was clear since It was posted here.
**broken link removed**
Back to my original question, do you see now what I meant by it?
Thanks.
It is very simple. Voltage difference! It is the potential that exists between one voltage source and another.
It is electromotive force. The force required to move electrons. A battery or generator is just like a pump. If you increase the size of the pump's diaghram or impeller you will generate more force and increase the pressure. In a generator, if you change the strength of the rotating DC electric field, you can increase the voltage or electromotive force, just like the pump.
Pumps can fill up a cylinder with gas and once the density of the gas molecules goes beyond an ambient level, the pressure will be said to increase and the gas will be said to be COMPRESSED. So it is storing that pressure, or force, and can be released and made to do work.
In a manner of speaking, a battery that is being charged is being filled with "compressed electrons"...Now don't get me wrong, this is not literal, but you might say that electric field strength is the equivelant of molecular density of a gas. If the field is stronger, it may be said to be "more dense". At least that is how my mind sees it without a lot of math and formulae.
Electrical pressure is potential difference.
Oh, another point though...potential difference does not have to be the voltage between positive supply and ground. It could be the difference between two positive supplies or even two negative supplies.
Someone correct me if I'm wrong, but did you know that you can run (many) electronic devices that require a 12 volt supply (customarily 12 volts vs ground potential) with two NEGATIVE power supplies....ie a -24 volt supply and a -12 volt supply would work. hook the -24 volts to the negative terminal and the -12 volts to the positive terminal and the device, in theory, will work. This is because a potential difference of 12 volts still exists which is the electomotive force required to make the device work.
I say in theory because I've never actually done this, but this is true as I understand it.
It is very simple. Voltage difference! It is the potential that exists between one voltage source and another.
It is electromotive force. The force required to move electrons. A battery or generator is just like a pump. If you increase the size of the pump's diaghram or impeller you will generate more force and increase the pressure. In a generator, if you change the strength of the rotating DC electric field, you can increase the voltage or electromotive force, just like the pump.
Pumps can fill up a cylinder with gas and once the density of the gas molecules goes beyond an ambient level, the pressure will be said to increase and the gas will be said to be COMPRESSED. So it is storing that pressure, or force, and can be released and made to do work.
In a manner of speaking, a battery that is being charged is being filled with "compressed electrons"...Now don't get me wrong, this is not literal, but you might say that electric field strength is the equivelant of molecular density of a gas. If the field is stronger, it may be said to be "more dense". At least that is how my mind sees it without a lot of math and formulae.
Electrical pressure is potential difference.
Oh, another point though...potential difference does not have to be the voltage between positive supply and ground. It could be the difference between two positive supplies or even two negative supplies.
Someone correct me if I'm wrong, but did you know that you can run (many) electronic devices that require a 12 volt supply (customarily 12 volts vs ground potential) with two NEGATIVE power supplies....ie a -24 volt supply and a -12 volt supply would work. hook the -24 volts to the negative terminal and the -12 volts to the positive terminal and the device, in theory, will work. This is because a potential difference of 12 volts still exists which is the electomotive force required to make the device work.
I say in theory because I've never actually done this, but this is true as I understand it.
LOL that's because**it is** the same thing! Isn't that what a definition is????
I have given you tons of examples of work/energy, and force and how they relate, and so have a few others who posted. How much more clear can this be? I mean, I really want to help!
OK one more example, and I'll use an electric example.
You connect an electric AC motor to a generator. The generator creates power, which is voltage and current (pressure and flow). When the motor spins, we say that it has become energized...it is in a state of energy, having the capacity to do work. Some of that energy being released in the form of heat, some of it mechanical movement. And when the motor shaft actuates a belt which drives a conveyor (the load), we say that it is actually doing work. The torque and speed of the rotor as it reacts to the load (the belt) we will call force.
pressure, flow, work, force, energy, potential.
See how one concept is related to the next, yet they aren't the same?
I can't explain this any better. I'm beginning to think you are waiting for the answer that agrees with your original post, which isn't going to be the case!
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