Volts x Amps = Watts (example: 12 volts x 5 amps = 60 watts) Now, here are some of the easiest equations you’ll ever have to use: Instead we measure for an abnormal drop in voltage in a circuit, which would indicate corrosion, too small a wire size, or a poor connection. In most cases it’s unrealistic for a boatowner to measure for ohms, simply because boat gear manufacturers don’t usually offer a baseline of resistance to measure against. This can happen even in a simple 12-volt system, so always use common sense and generous wire gauges. Try to put too much current through too small a wire, and you can create enough resistance to start melting things and causing fires. Resistance always creates heat, and the greater the resistance, the more heat. The thicker the wire, the more easily current will flow through it. Resistance is determined both by the wire’s length and its thickness, or gauge.
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