4Ω vs. 2Ω

Mr Marv · Oct 1, 2008

ANDYTACOMA said: ↑

Ω=ohm
ohm's measure resistance

The mathematical equation that describes this relationship is:

I = V/R

where I is the current in amperes, V is the potential difference in volts,and R is a circuit parameter called the resistance (measured in ohms, also equivalent to volts per ampere).
Click to expand...

ANDYTACOMA said: ↑

I apologize if what i said was offensive. I meant nothing demeaning by my statement, I was simply responding to this
"That's the complicated answer direct from the book"
Because as far as I'm concerned that is NOT a complicated answer, I was assuming that people would hopefully be able to read and complete simple arithmetic.
Click to expand...

Thanks for explaining that since I wasn't quite sure how to take it and certainly was not meaning to be disrespectful to you. The reason for my comment with the "wink" was that I recognized your post word for word from "the book" since whenever people ask me about Ohm's Law and are looking for the "technical" terms that's where I send them. In any case the OP asked about the "difference" in Ohm's and I gather I "assumed" something myself and tried to explain it in a way I felt anyone could understand.

Ohm's law
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This article is about the law related to electricity. For other uses, see Ohm's acoustic law.
A voltage source, V, drives an electric current, I, through resistor, R, the three quantities obeying Ohm's law: I = V/R.
A voltage source, V, drives an electric current, I, through resistor, R, the three quantities obeying Ohm's law: I = V/R.

Ohm's law applies to electrical circuits; it states that the current through a conductor between two points is directly proportional to the potential difference (i.e. voltage drop or voltage) across the two points, and inversely proportional to the resistance between them.

The mathematical equation that describes this relationship is:

I = {V} / {R}\,

where I is the current in amperes, V is the potential difference in volts,and R is a circuit parameter called the resistance (measured in ohms, also equivalent to volts per ampere). The potential difference is also known as the voltage drop, and is sometimes denoted by U, E or emf (electromotive force) instead of V.[1] I is from the German Intensität meaning "intensity".[citation needed]

The law was named after the German physicist Georg Ohm, who, in a treatise published in 1827, described measurements of applied voltage and current through simple electrical circuits containing various lengths of wire. He presented a slightly more complex equation than the one above to explain his experimental results. The above equation is the modern form of Ohm's law.

The resistance of most resistive devices (resistors) is constant over a large range of values of current and voltage. When a resistor is used under these conditions, the resistor is referred to as an ohmic device (or an ohmic resistor) because a single value for the resistance suffices to describe the resistive behavior of the device over the range. When sufficiently high voltages are applied to a resistor, forcing a high current through it, the device is no longer ohmic because its resistance, when measured under such electrically stressed conditions, is different (typically greater) from the value measured under standard conditions (see temperature effects, below).

Ohm's law, in the form above, is an extremely useful equation in the field of electrical/electronic engineering because it describes how voltage, current and resistance are interrelated on a "macroscopic" level, that is, commonly, as circuit elements in an electrical circuit. Physicists who study the electrical properties of matter at the microscopic level use a closely related and more general vector equation, sometimes also referred to as Ohm's law, having variables that are closely related to the I, V and R scalar variables of Ohm's law, but are each functions of position within the conductor. See the Physics and Relation to heat conduction sections below.
Click to expand...

montgomery_30824 · Oct 1, 2008

Alt + 234

montgomery_30824 · Oct 1, 2008

alt + 234

montgomery_30824 · Oct 1, 2008

nope nuthin

Hotdog · Oct 1, 2008

Chickenmunga said: ↑

Or you could do it the engineer's way and type ALT + 234
Click to expand...

super nerd!

I have NEVER heard of that and I could have used it many times. Do you have a link for shortcuts?

Hotdog · Oct 1, 2008

Ω

Chickenmunga · Oct 1, 2008

http://www.asciitable.com/

Use the column marked 'Dec' which refers to the decimal value of the character.

ALT + 234
Click to expand...

Hehe, I meant hold down the alt key, type 234, then let go of the alt key.

I should also note that this works only for ASCII and extended ASCII characters. Stuff like the musical note is Unicode, and our American keyboards can't do that (I guess on British keyboards there's an 'AltGr' key that will handle unicode), so you need to do it with the character map that lsocoee mentioned. .

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