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## Re: Electrical Theory

 To: "Rick Huber" , "Fred Pixley" Re: Electrical Theory "Paul Hunt" Sat, 15 May 1999 17:51:06 +0100
 ```Never mix water and electricity PaulH. http://freespace.virgin.net/paul.hunt1/ -----Original Message----- From: Rick Huber To: Fred Pixley Cc: mgs-digest list Date: 04 May 1999 23:45 Subject: Re: Electrical Theory >Fred and others, > >Since I started this brake switch is hot thread, I thought I'd throw my >2 cents in. > >In my tiny mind I understand it this way. Voltage is like the pressure >of water in a pipe and current is like the flow of water through the >pipe. Resistance to flow causes pressure drop, roughly equivalent to >power. With the system energized with the 12 volt battery to an open >switch, there is pressure, or 12 volts available to the switch, but no >current flow, like pressure up to a spray nozzle on the hose. Once the >switch is closed, when you press the brake pedal, 12 volts is available >to the light bulb. If the ground past the bulb is open, i.e. not >grounded, then there is 12 volts available through the whole circuit, >but still no current flow. Once the ground past the bulb is closed, as >much current flows through the system as the element in the bulb will >allow (it's the orifice or the spray nozzle on the hose), so the element >is like an orifice in a pipe. 12 volts upstream, current flow of a >couple of amps through the element, producing power and therefore light >and heat, and then much lower voltage on the downstream side of the bulb >back to ground. > >As has been said already, normally, there is essentially no resistance >anywhere in the circuit except at the light bulb element. However, when >the contacts in the switch become corroded over 24 years, they become >the resistance in the circuit more than the elements in the bulb, so the >power is taken across the contacts in the switch and it gets hot. >Downstream of this orifice, there's not enough voltage left to light the >bulbs. The analogy here is a kink in the hose upstream of the nozzle, >therefore no flow through the nozzle when it's open. > >So what I did was take the switch apart, clean the contacts very >thoroughly (remove the kink in the hose), and now I have brake lights again. > >It seems so simple now trying to explain it, why couldn't I figure it >our this easily when I was troubleshooting? > >Safety Fast, > >Rick Huber >75 V8 B Daily Driver >65 B undergoing lengthy restoration ```
 Current Thread Electrical Theory, Fred Pixley Re: Electrical Theory, Robert Alan Reisse Re: Electrical Theory, Robert Alan Reisse Re: Electrical Theory, dresden Re: Electrical Theory, Rick Huber Re: Electrical Theory, REwald9535 Re: Electrical Theory, Ajhsys Re: Electrical Theory, REwald9535 Re: Electrical Theory, JSMcC Re: Electrical Theory, Paul Hunt <=