Been trying to get my head around Volts, Amps, Ohms and Joules recently.
I am probably missing something very basic that I am finding hard to find an answer for.
I get the basic idea of the following (water comparison):
- Coulomb = a set amount of electrons (litre)
- Volts = Pressure at which electrons want to move between 2 points. E.g. the number of electrons in a given space pushing away from each other (Bar)
- Amps = Amount of electrons that travel through a coulomb in a second. (litres/min)
- Joule = Unit of Energy e.g. Cost of moving 1 volt through 1 Coulomb (Newton)
- Ohms = Resistance of electrons moving between 2 points (pipe diameter)
My confusion is with Joules/Amps/Electrons when you add a device to a circuit. (e.g. light bulb)
How correct/incorrect is the above understanding?
Is it not the electrons that get converted into heat, which in turn gets converted into light or would losing electrons cause it to change its physical properties?
After several hours of thinking and researching (while writing this question) is the following missing piece correct?
Joules is the energy, which is the force applied by a cell (power station/battery) onto a circuit (by adding electrons?), e.g. something like Kinetic Energy but for electrons and the light bulb takes some of that energy and by converting it into heat.
Is it correct to think of the following: The light bulb is similar to a water turbine, in a pressured water circuit. The volume of water going in has to be equal to the volume of water going out (if no leaks) which is the amount of electrons. The water turbine spins, and what is lost is the kinetic energy of the water moving (being created by whatever is creating the pressure in the circuit, e.g. pump) and transferred into the turbine.
The reason I ask this is because I have been trying to figure how RCD's work in domestic household circuits. (The physics behind it) And why the Amps are the same going in and coming out.