Ohm's Law

Bubbles

Does it really matter unless your an electrical engineer or doing serious design calculations? I've been doing all types of electrical work for 9 yrs and really never needed it except for forum talk and for fun at night.

mahlere

bubbles....hahaha...nice name

i use parts of ohms law daily to determine circuit sizes, amperages, etc.

Bubbles

I've probably been computing load calcs and amps and volts subconciously for years since the physics days way back when. I basically use P=IxE to get everything I need. I'm mainly wondereing because there is so much emphasis from employers and test saying you must know Ohms Law!!! I really never needed it and probably won't in reality?? I have an old timer working for me and he knows none of that stuff but he can walk into a bee's nest and staighten it out like know one can.

te12c02w

Without a working knowledge of ohm's law, how would one figure out how many feet of electric heat you could put on a circuit or a electric line break t-stat? How would you know how many outside 75watt or 150watt lamps you could put on a 20a breaker or a 15 amp toggle switch? I use ohm's law at least once a week, even if I don't really sit down and figure anything out. It is like a code book, every spark should at least know how to apply it to his own work. If you can't remember it, write it in your code book or just look at the front of Ugly's cover.

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robertc65

If you are using the formula P = I x E (Power = Current X Voltage) then you are using OHMS law.

Celtic

Mahlere...remember when you used to blow bubbles?









I think he's here to say HI!

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mahlere

one time...and they never let you live it down...

Celtic

LOL

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randomkiller

Now that wasn't his girl friends cat right?

Celtic

Not unless the cat can read and type(write)

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mahlere

damn cat was potty trained too...

Magnettica

If I needed to light a specific area with 400 watt MH, I could only do 4 of them at 120 volts (cont load). But if I needed more than that, I could do 8 of them and operate them at 240 volts. That's basic Ohm's law right there. I don't know how you could work out in the field w/o simple knowledge like that. I have the fancy Mike Holt Ohm's law pocket-size sticker on the back of my calculator at work. Comes in handy sometimes.

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Bubbles

I've done all those things mentioned above just using pie. I thought OHms had to do with relationship of EMF , Current and Resistance? That is one I rarely use and only for fun. I appreciate all the comments. I guess PIE and E=IR are both Ohms then?

Sparky Joe

R is ohms
R=E/I is ohms law
P=ExI is the power formula

PrecisionFloors

Ohm's Law is THE fundamental first piece of knowledge needed to do ANY electrical/electronic work. (I was an aviation electronics tech in the Navy way before I did floors) It was the first thing they taught us at tech school.

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Sparky Joe

You'd be surprised(or scared like me) how many guys out there wiring places daily that have no clue what an ohm or an amp or even a volt is, let alone the relationship between the three

Dustball

Same here except it was automated manufacturing for me.