Thursday, March 3, 2011

Lab - Introduction to DC Circuits

In this lab we investigated DC circuits and the added resistance that exists in wires.  The idea was to set up a simple circuit with a power supply and load, and then use a variable resistor box to simulate the effects of long cables in a circuit.  We found that additional cabling(variable resistor box) draws additional power that would increase the rate of discharge of a battery(power supply).  Thus, since resistance R is proportional to the length of wire, a longer wire will consume more power due to the relationship P=I^2R=V^2/R.   

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