What is the Difference Between Amperage and Voltage?
Voltage is a difference of potential between two points, (measured in voltage) it is the push that, once you have a complete circuit, current, (in amps) will flow. So, you can have voltage without current flowing but never current without voltage, (potential difference).
Think of voltage as pressure. Pushing electrons around a circuit.
Think of amperage as quantity. Buckets of electrons are conveyed in a circuit.
The other responses here in Quora are very good.
Develop a comfortable working relationship with the elements of Ohm’s law from an analogy standpoint.
** Voltage is the force that moves electrons. Amperage, or current, is the electrons themselves moving through a conductor.
It’s common to think of electricity flowing through a wire as analogous to water flowing through a hose. Voltage corresponds to the water pressure, and current corresponds to the amount of water that flows.
** If you think of electricity like water, amps are the amount of water and volts are like water pressure.
An ampere unit actually represents the flow for a charge, you could think about it sort of like the number of electrons coming out of a power source.
A volt unit is the amount of energy per charge. You can think of it as how hard the power source is pushing those electrons.
The common thing in both of those units is a charge. The unit for electric charge is the Coulomb “C”. An electric charge doesn’t have to be from electrons in a metal, it can be ions in a liquid or a static charge on you when you rub a balloon on your hair. Higher C means more charge.
Amps are Coulombs per second, A = C/s
Volts are Joules per Coulomb, V = J/C
And you may know joules are a unit of energy.
You get electrical power by multiplying amps by volts,
W = A * V = C/s * J/C = J/s
When you do that you end up with a unit joules per second, which is just Watts!
Note, I've simplified this stuff for quick understanding, you would get a lot more detail in a high school physics class.