The objective of this lab was to approximate the max. distance between a battery and load (the 1000 ohm resistor) that would still allow the circuit’s proper functioning, as a 12V battery would work accurately if the voltage is greater than 11V. Rather than use AWG #30 wires, we used a resistor box to act as the resistance of the cables. The box reached its peak at 87 ohm by the time the battery lowered to 11V, and finding the power used by the load (0.1232 W) and the power lost to the cable (0.011 W), the efficiency (= Pout /(Pout + Plost ) was 92%. Assuming the resistance of an AWG #30 wire to be 0.3451 ohm/m, the max. distance rounded to about 252m. With the cable looping back to the battery, the displacement from the battery to the load would actually be 126m, which is still a long distance. Don’t worry anymore about connecting to your neighbor’s battery supply during days of short circuits!
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