hi there
i'm still realy confused about the ohms law and how do i understand it easly .. : on Subs and amps ?
help to confusing
many thanx dudes.
Replies (2)
Pinch on 08/15/2003 03:46:14
Ohm's Law simply states that the Voltage across an element in a circuit is directly proportional to the Current flowing through the element multiplied by the element's Resistance. Using this formula, you can derive the third circuit parameter given the other two. V=I*R is the graphical form of the law.
Another useful formula is P=I*V (the Power dissipated by an element is directly proportional to the Current flowing through the element multiplied by the Voltage across the element). This formula is simply a derivation of the original Ohm's Law formula.
Oh yeah and just for the records an element can be anything. For example, one time on Mr. Wizard, he cooked a hot dog by hooking up two wires to either end. In this case, the "element" is the hot dog. The Resistance would be the value you would get if you hooked up an Ohmmeter to either end of the sausage. Then, if you knew the voltage you applied across the hot dog, you could calculate the current flowing through it.
As far as subs and amps are concerned, I think you are trying to figure out series and parallel wiring. Yeah, this stuff can get kinda confusing...but it helps if you think about what is actually goin' on. Lets think about a milk shake. You just paid 5 dollars for a good shake, and now you want to enjoy it. So you put your lips to the straw and start suckin'. Depending on how hard you suck, and how big the straw is, a certain amount of this dairy delight will finally make it to your mouth. Ok, so you can probably picture this and relate to it in some way or another. Now lets say you have the same 5 dollar milk shake, but you go at it with two straws instead of the one. They're the same size, but there are just two of them side by side now. Do you suppose you'll have to suck harder, or not as hard to get the same amount of the shake to your mouth? Well, theoretically if you suck just as hard you'll get twice the amount of the shake into your mouth as if you had just once straw (since you've got two now). Now just one more scenario (bear with me). Lets take those same two straws, but connect them together. So now you've got one big long straw. With this setup, you'll have to suck twice as hard to get the same amount of the shake since it's got to travel through twice the straw.
Back to the world of electronics.
Current flowing through a sub (from an amp) is like you sucking a milk shake through a straw. If you've got two subs, and they're connected in parallel, it's like having two side-by-side straws through which to suck the shake. If they're connected in series, it's like having one long straw. And if you forget which is which, just look at the numbers. A higher impedance means it's tougher for the current (milk shake) to get through to the sub (your mouth).
Well it's late and I'm pretty tired...so I'm gonna stop rambling. I hope this helped at least a little. Please feel free to ask me some questions as I may have just confused ya more. For some reason though, I just like the milkshake analogy. Have a great night all!
Pinch
Swez on 08/15/2003 17:36:17
Good story picture! That's a good way to explain a hard subject.
Instead of busting you brain to figure all this out, just tell us what amp and subs you have now and we'll try to walk you through the process.
GIVE FULL DETAILS ON SUBS AND AMP YOU ARE USING HERE !!! That means maker, model numbers for each item and power ratings if you have them or a web link.
Example:
Amp: Rockford Fosgate Punch 500S: 125x2 @ 4ohm - 500 watts RMS total
Subs: Rockford Fosgate, RFP3212: 12" Punch HE2 Dual 4ohm Subwoofer - 400 watts RMS
Swez
PS If you want to learn more about Ohm's law and its derivations, GOTO: http://www.eatel.net/~amptech/elecdisc/ohmslaw.htm
i'm still realy confused about the ohms law and how do i understand it easly .. : on Subs and amps ?
help to confusing
many thanx dudes.
Replies (2)
Pinch on 08/15/2003 03:46:14
Ohm's Law simply states that the Voltage across an element in a circuit is directly proportional to the Current flowing through the element multiplied by the element's Resistance. Using this formula, you can derive the third circuit parameter given the other two. V=I*R is the graphical form of the law.
Another useful formula is P=I*V (the Power dissipated by an element is directly proportional to the Current flowing through the element multiplied by the Voltage across the element). This formula is simply a derivation of the original Ohm's Law formula.
Oh yeah and just for the records an element can be anything. For example, one time on Mr. Wizard, he cooked a hot dog by hooking up two wires to either end. In this case, the "element" is the hot dog. The Resistance would be the value you would get if you hooked up an Ohmmeter to either end of the sausage. Then, if you knew the voltage you applied across the hot dog, you could calculate the current flowing through it.
As far as subs and amps are concerned, I think you are trying to figure out series and parallel wiring. Yeah, this stuff can get kinda confusing...but it helps if you think about what is actually goin' on. Lets think about a milk shake. You just paid 5 dollars for a good shake, and now you want to enjoy it. So you put your lips to the straw and start suckin'. Depending on how hard you suck, and how big the straw is, a certain amount of this dairy delight will finally make it to your mouth. Ok, so you can probably picture this and relate to it in some way or another. Now lets say you have the same 5 dollar milk shake, but you go at it with two straws instead of the one. They're the same size, but there are just two of them side by side now. Do you suppose you'll have to suck harder, or not as hard to get the same amount of the shake to your mouth? Well, theoretically if you suck just as hard you'll get twice the amount of the shake into your mouth as if you had just once straw (since you've got two now). Now just one more scenario (bear with me). Lets take those same two straws, but connect them together. So now you've got one big long straw. With this setup, you'll have to suck twice as hard to get the same amount of the shake since it's got to travel through twice the straw.
Back to the world of electronics.
Current flowing through a sub (from an amp) is like you sucking a milk shake through a straw. If you've got two subs, and they're connected in parallel, it's like having two side-by-side straws through which to suck the shake. If they're connected in series, it's like having one long straw. And if you forget which is which, just look at the numbers. A higher impedance means it's tougher for the current (milk shake) to get through to the sub (your mouth).
Well it's late and I'm pretty tired...so I'm gonna stop rambling. I hope this helped at least a little. Please feel free to ask me some questions as I may have just confused ya more. For some reason though, I just like the milkshake analogy. Have a great night all!
Pinch
Swez on 08/15/2003 17:36:17
Good story picture! That's a good way to explain a hard subject.
Instead of busting you brain to figure all this out, just tell us what amp and subs you have now and we'll try to walk you through the process.
GIVE FULL DETAILS ON SUBS AND AMP YOU ARE USING HERE !!! That means maker, model numbers for each item and power ratings if you have them or a web link.
Example:
Amp: Rockford Fosgate Punch 500S: 125x2 @ 4ohm - 500 watts RMS total
Subs: Rockford Fosgate, RFP3212: 12" Punch HE2 Dual 4ohm Subwoofer - 400 watts RMS
Swez
PS If you want to learn more about Ohm's law and its derivations, GOTO: http://www.eatel.net/~amptech/elecdisc/ohmslaw.htm
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