Please 'Boom' Responsibly As most of you have noticed, the noise ordinances have become much tougher lately. Most of this is due to idiots, yes IDIOTS, who drive through residential areas with their windows down while their system is playing at full power. To make things worse, the music they listen to has all sorts of foul language that's not suitable for small children, (who may be playing outside). There are even a few people, who are even beyond idiot status, that play their systems at full power through residential areas after 10:00 PM (when many people go to bed). I don't believe that this type of behavior is good for the industry. If the fines get too stiff, people will stop buying large systems. If this happens, more people will get out of car audio (who wants a mediocre system). People get interested in things because they're exciting. A deck and four 6.5" speakers are not going to interest many of the younger car audio enthusiasts. If car audio enthusiasts keep annoying more and more people, the fines will keep getting tougher. All of this will only reduce interest in the equipment that fuels the industry. If you want to listen to your system at full volume, get out on the highway where there's little chance of bothering anyone. When you get to a red light, turn it down. If the only thing attractive about you is your 'system', you have some work to do. Bottom line... Think about what you're doing. Think about other people. It's not the end of the world if you have to turn the volume down for a little while. |
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OHM'S LAW | |||
BASE FORMULAS | P=I*E | E=I*R | |
TO FIND VOLTAGE | E=P/I | E=I*R | E=SQR(P*R) |
TO FIND CURRENT | I=P/E | I=E/R | I=SQR(P/R) |
TO FIND POWER | P=I*E | P=E2/R | P=I2*R |
TO FIND RESISTANCE | R=E2/P | R=E/I | R=P/I2 |
P = Power in Watts E = Electromotive Force in Volts I = Electrical Current in Amps R = Electrical Resistance in Ohms SQR = Square Root |
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Short Refresher
Course Change of Resistance: In the following diagram, you can see that the only difference between the diagrams on the left and the diagrams on the right is the resistance in each 'system'. The resistance in the faucet corresponds to the amount that the valve is open. In the wire, the resistance is the size of the opening* in the piece of wire. You can see that the voltage/pressure is the same for both the left and right examples. What you should note in this diagram is... All else being equal, if there is an increase in resistance, the current flow will be reduced. You can see that the current flow in the rightmost wire is half of the current flow in the leftmost wire. This is because the rightmost wire has half of the area for the electrons to pass through.
*Please note that the size of the 'opening' is is analogous to resistance. There is no physical restriction in a real piece of wire. With the formula: I = E/R You can see that the current flow is inversely proportional to the resistance in the circuit. More Resistance = Less Current And for those who are more graphically inclined...
Change of Voltage: In the following diagram, you can see that the resistance in all of the systems is equal. This time we made a change in the voltage/pressure. You can see that the increased voltage causes an increase in current even though the resistance in both the left and right systems is equal.
With the formula: I = E/R You can see that the current flow is directly proportional to the voltage applied to the resistance. More Voltage = More Current
Well, now that that's been explained to death, onto the math!
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If you want more examples, the resistor page has more fun than a barrel of monkeys.
If you want to try a few for yourself, the calculators below will allow you to check your math.
Find: Power dissipation and Current flow from Resistance and applied Voltage.
Click HERE to make it fill this window.
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You should remember:
1.If you have any 2 of the 4 electrical properties, you can find
the other properties through Ohm's law.
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