What are VOLTs, OHMs & AMPs?

it never would have happened without Cooper trucks one of the questions I get quite often when I'm teaching because I teach electricity is what exactly is voltage well it's been taught forever that it's electrical pressure and since all of you guys pretty much understand how pressure works this should make pretty good sense this is an electron an electron is the negative negatively charged particle that spins around the outside of an atom and it's what actually moves through a wire that's what actually makes electricity work electron electricity well I like to think of these electrons as negative because they had a little negative attitude and a little negative charge yeah maybe it works maybe it doesn't for you but it also helps to think about magnets because everybody watching this understands what a magnet is and how it works okay you take two magnets and you put the two north poles together then they repel each other okay everybody gets that and the way it's taught in class is that like poles repel however we all know that if you take magnets and you put them together with the north and south pole together or or the south or north pole together then they attract there's a force that's actually pulling them together and that force is magnetic force and we also teach that unlike poles attract so like poles repel and unlike poles attract so let's take our electrons which both have negative charges and we'll put them together and they're fairly negative as you can tell I draw them that way because electrons are negative and those look like some guys they've got some pretty negative attitudes well they have the same charge and if you apply the magnet example then what you get is you get a force that's trying to push these two guys apart the force is pretty powerful it's a pretty strong force and it's what makes our components run make some work so if you think about this it works really well to just visualize a spring between the two electrons pretend they're billiard balls on a pool table well you probably already have this figured out by now because if you take two pool balls and put them on a table with the spring in between them and you let go they're going to move because there's pressure in between them all right well now they're a little more angry and a little more negative because they're being forced to be much closer to each other and when you push these guys closer together the force between them is pretty huge and this is why it's called tension electrical tension high tension electricity they're tense they're stuck they're next to each other want nothing more than to get as far away from each other as possible that's what makes them move the spring is much more tightly compressed now and if you carry this analogy to the end the higher compression means higher voltage so how does this work for us why is this theory important to us it's important because voltage is what we measure and knowing how voltage works helps when you measure it so you'll know what it's doing or not doing well if you put a bunch of these electron guys together put them in a box they call it a battery so all these little electron guys in here all have negative charges and they're all trying really hard to get pretty far away from each other and that then puts them under pressure this pressure is what makes everything happen you can't have flow without a difference in pressure hydraulics or go Mattox it doesn't matter so if we take the battery and we connect the battery into a circuit and by the way it's called a circuit because it's a circle be given place to go they're going to go they don't actually move with the speed of light but the effect is felt at the speed of light so with a switch open here you're going to have charges to the left and charges to the right the polarity is difficult to explain but effectively electricity is waiting at the switch sitting there stable not moving that's called static voltage but as soon as you close the switch now things start to happen they start moving and moving and moving and moving moving really really fast we put a motor in the way and all of this movement works to create motion so the motor goes zoom and if a bunch of these guys in a box sitting there waiting to go is voltage then it's pretty easy to understand what current is it's them moving and getting away from each other and we use that to do work all right every load has resistance lightbulbs coils resistors and the resistance is measured in ohms and the guy that figured this out is name was George Simon ohm hence the word now for those of you who are like like up on this stuff yeah motors do have back EMF but we're going to cover that another day we're just going to treat it as if it has ohms because effectively it does have ohms all right well we get our motor there and you ask yourself what is the job of any resistor or of any resistance what's its job and the simplest way to understand it is that the job of the resistance is to keep the fuse from blowing oh and oh yeah by the way then if it's a motor then it turns but the reason that the fuses don't blow when you turn things on is because the thing you're turning on has resistance so how do we summarize this well voltage which is pressure pushes amperage which is current through a resistance this is actually Ohm's law because Ohm's law is a concept Ohm's law is a principle Ohm's law is not a math equation they use e equals IR and they teach it as math but it is not a math problem Ohm's law is a concept not math so voltage which is pressure resistance and current work together to make our machines go you

Channel: Daniel Sullivan

Views: 2,030,172

Rating: 4.823019 out of 5

Keywords: Voltmeter, Relay, leads, ohmmeter, ammeter, ampmeter, troubleshooting, electrical, electricity, diagnostics, powerprobe, multiplex, multiplexing, PLC, ECM, diode, kenworth, peterbilt, mack, freightliner, caterpillar, komatsu, testlight, TESlite, Enhanced, Leads, sterling, volvo, manitowoc, p&h, terex, cement, mixer, tanker, general, electric, locomotive, thermoking, corrosion, wiring, resistance, voltage, drop, test, light, test light, loadpro, LOADpro, sullivan, training, systems, electronic, specialties, power, probe

Id: zYS9kdS56l8

Length: 8min 43sec (523 seconds)

Published: Fri Jan 21 2011