Resistance

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.

Resistance:

Resistance is the measure of a device's opposition to the flow of electrical current. Its unit of measure is the ohm. If a device with one ohm of resistance is connected across a one volt power supply, the flow of current through the device will be limited to one amp. If the resistance is doubled, and the power supply voltage remains at one volt, the current flow will be one half amp. As you can see, more "resistance" will reduce the current flow in the circuit (if voltage remains constant).

In the Flash demo below, the valve will be analogous to the resistance in the water distribution system. For this example the pump will again produce a constant pressure before the valve. When the valve is almost closed, the resistance is high. The resistance to the flow of water is high therefore the current flow is low. When the valve is completely open, the flow of water is very high because the resistance to the flow is very low. For best results, press the buttons alternately (up, down, up, down...). The valve in the upper right hand corner shows the position of the gate in the valve on the pipe.

Remember, Pressure = voltage.

Now let's say that the valve position is constant (partially open) but the pressure that the pump applies to to the valve is going to vary. When the pressure (voltage) is high, the flow through the valve is going to be high. At moderate pressure the current flow will be moderate and of course when the pressure (voltage) is low the current flow will be low. For best results, press the buttons alternately (down, up, down, up...).

Remember, Pressure = voltage.

Now go back to the voltage section and reread all pages up to this point. After reading the pages for the second time go to the next page (don't get caught in an endless loop).

You should remember:
1.Resistance is the opposition to the flow of electrical current.

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