Physics 8B 6 – Current, Resistance, Ohm’s Law rev 4.0 1 6 – Current, Resistance, Ohm’s Law 1. In the diagram on the left, water flows from pipe section 1 to pipe section 2. Think about individual water particles in each section of the pipe. a) How do the flow rates (volume/time) in the two pipe sections compare? (I.e. As the particles shown move past the dotted line in section 1, how many particles move past the dotted line in section 2, more, the same, or less?) When applying a fluid model to circuitry, current can be thought of as the flow rate in charges per second. The diameter of the pipe relates to resistance in a circuit, where pipe section 1 is equivalent to small resistance and pipe section 2 is equivalent to large resistance. In the diagram on the right two resistors are connected in series, R 1 has small resistance while R 2 has large resistance. b) Using your reasoning about water through a pipe, what can you say about the current at points A,B,C,D,E? c)
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This note was uploaded on 09/18/2011 for the course PHYSICS 8B taught by Professor Shapiro during the Fall '07 term at University of California, Berkeley.