With the points closed you have a complete electrical circuit that has two resistance units, the resister and the coil. In your case the resistance value is the same for both as shown by having 1/2 circuit voltage between the resistance units. Each unit will draw 1/2 the total amperage of the system. With the points open the circuit is no longer complete. There will be no amperage draw in that circuit. The circuit still has electrical potential of 12.4 volts. Coming from the battery the voltage will be battery voltage up to the point where the circuit is open. From the break in the circuit back to the battery the voltage will be zero.
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Today's Featured Article - History of the Nuffield Tractor: Conclusion - by Anthony West. In the last piece I mentioned that Nuffield had reached the stage where they had chosen to drop the "Universal" from production. The two new models were given three figure numbers, instead of "three" and "four". Model numbers were introduced to help farmers and dealers instantly recognize the engine size and horsepower of the tractor, the 4/60 had a four cylinder diesel engine which developed 60 bhp at 2,000 rpm. The 3/42 had a 3 cylinder diesel engine which produced 42 bhp at 2,000 rpm. Th
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