Trojan Boat Forum

For the electrical and wiring phobics out there. This may help... Best viewed maximized.

http://www.jamestowndistributors.com/us ... mail011713

That's a great find for the basics Jamie. Hopefully that will help explain why we keep stressing the need to determine the load and the TOTAL length of the cirduit. Did you catch what was missing in his circuit diagram? There are very few exceptions but circuits need to include a protection device like a fuse, breaker, etc. Boy would I love to have that building.

I really wasn't paying attention or watch the whole video. Just thought I'd pass it along as there are some who may find wiring intimidating.

Yes indeed, that is one very NICE building!

How many of us wish the P.O. of our boats had seen that...

alexander38 wrote:How many of us wish the P.O. of our boats had seen that...

Ya no kidding eh Tony. Some of the stuff I see just boggles my mind. I always think of it like this; How many people do their own wiring in their house or car? And if they do and get it wrong, and the house or car catch fire, chances are you can walk out the front door or pull over and get out of the car. If your boat catches on fire when you're offshore with your family, you're in a world of hurt unless you have a dinghy or something, and you better get into it fast. Yet people think nothing of McGyvering their on-board electrical. They just don't seem to put "fire" and "2 miles offshore" together in their thought process. I don't get it. The "what if offshore" should be considered in everything you do to a boat.

Big D wrote:

alexander38 wrote:How many of us wish the P.O. of our boats had seen that...

Ya no kidding eh Tony. Some of the stuff I see just boggles my mind. I always think of it like this; How many people do their own wiring in their house or car? And if they do and get it wrong, and the house or car catch fire, chances are you can walk out the front door or pull over and get out of the car. If your boat catches on fire when you're offshore with your family, you're in a world of hurt unless you have a dinghy or something, and you better get into it fast. Yet people think nothing of McGyvering their on-board electrical. They just don't seem to put "fire" and "2 miles offshore" together in their thought process. I don't get it. The "what if offshore" should be considered in everything you do to a boat.

++++10000000

Agreed

An easy to remember how to get any one of Ohms law three values is by the diagram of:

Voltages over Resistance and Current I cannot draw it here but there is a bar under voltage and a verticle bar between Resistance and Current.

It works like this, to get value for resistance divide volts by Current. To get volts multiply resistance | current. This little diagram is a no brainer and I use it every time I work with Ohms law.

Draw a circle, a line dividing top half and bottom half and a verticle line dividing the bottom half, Volts in top half, current and resistance on either side of bottom half line. Ergo all pieces are in the proper place for calculating.

larryeddington wrote:An easy to remember how to get any one of Ohms law three values is by the diagram of:

Voltages over Resistance and Current I cannot draw it here but there is a bar under voltage and a verticle bar between Resistance and Current.

It works like this, to get value for resistance divide volts by Current. To get volts multiply resistance | current. This little diagram is a no brainer and I use it every time I work with Ohms law.

Draw a circle, a line dividing top half and bottom half and a verticle line dividing the bottom half, Volts in top half, current and resistance on either side of bottom half line. Ergo all pieces are in the proper place for calculating.

Here's a diagram at this link Larry: Cover the item you're trying to figure out and use the other two to calculate the answer. The advanced wheel lower in the page is the one I use as it allows to calculate with power/wattage.
http://www.hamuniverse.com/ohmslaw.html

Here's a good one of the advanced wheel with written formulas as well:
http://www.the12volt.com/ohm/ohmslaw.asp

yep that is it, not trying to figure out as I understand it but the simple diagram is what taught it to me and can be very helpful to others.

did not want to explain power, wattage, amps but it is simple as well.


Thx Big D.

larryeddington wrote:....the simple diagram is what taught it to me....

Me too Larry. Sure helps - no guess work. If one can just remember that picture, you can do a lot. I'm sure you understand the wattage thing but for the benefit of others, the wattage calculation makes things a little easy also, ie; rather than trying to figure out or measure how much current a circuit has, just count all the 10 watt lights for example in the cabin that are on that circuit and it gives you the wattage of the circuit. From there, you can get current. Once you know that and the length of circuit, you'll know the size of wire you need to build the circuit or if an existing circuit can handle more lights and how many based on existing wire size.

Yep got that as well W=V*A

learned them a long time ago and has been verhy helpful over the years, IMO everyone should learn them.