23-07-2014, 08:55 PM
Al, thanks for the reply, I will alter a few things now from the original post just so I can simplify things in my brain (it's the heat) and make it less confusing.
A 12.6 volt battery, the voltage will be constant under load.
A bulb rated at 55 watts at a supply voltage of 12.6 volts.
1st) The bulb is connected direct to the battery with very short thick wire it's resistance is so low that we can ignore it for this discussion, the bulb is now receiving the full 12.6 volts and is dissipating 55 watts, the current flowing through it is 4.365 amps and it's deduced resistance is 2.886 ohms.
2nd) The bulb is reconnected to the battery, one side of the bulb is connect to it by a very thick short piece of wire again, we shall ignore it's resistance again because it's so low, the other side of the bulb is connected to the battery via length of cable which has a conductor that has a resistance of 0.054 ohms, assume in this case that resistance of the conductor will remain constant when the load current is flowing through it.
Can the voltage drop along the cables conductor be ascertained without using a test meter?
Would using the graph in the original link make any difference? I've put the link here as well to save scrolling back to my original post:
http://www.clarisonus.com/Archives/TubeT...istics.pdf
Lawrence.
A 12.6 volt battery, the voltage will be constant under load.
A bulb rated at 55 watts at a supply voltage of 12.6 volts.
1st) The bulb is connected direct to the battery with very short thick wire it's resistance is so low that we can ignore it for this discussion, the bulb is now receiving the full 12.6 volts and is dissipating 55 watts, the current flowing through it is 4.365 amps and it's deduced resistance is 2.886 ohms.
2nd) The bulb is reconnected to the battery, one side of the bulb is connect to it by a very thick short piece of wire again, we shall ignore it's resistance again because it's so low, the other side of the bulb is connected to the battery via length of cable which has a conductor that has a resistance of 0.054 ohms, assume in this case that resistance of the conductor will remain constant when the load current is flowing through it.
Can the voltage drop along the cables conductor be ascertained without using a test meter?
Would using the graph in the original link make any difference? I've put the link here as well to save scrolling back to my original post:
http://www.clarisonus.com/Archives/TubeT...istics.pdf
Lawrence.
