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# Plab13 - Lab 13 Circuits Series and Parallel Ohms Law and...

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Lab 13: Circuits: Series and Parallel, Ohm’s Law and Electrical Power SAR Physics A M Kolchin I. Introduction A closed circuit is a network of conducting wires and devices through which electrons ﬂow. The ﬂow is maintained by a source of power, in this case, a battery. Remember that the direction of current is the perceived direction of the ﬂow of positive charge and is therefore opposite to the direction of electron ﬂow. In this lab, we will investigate the properties of series and parallel circuits. In so doing, we expect to validate Ohm’s Law: V = IR by current and voltage measurements. This will enable us to calculate resistances for which we have accepted values. Also, we will investigate the properties of series and parallel circuits with regard to power consumption in light bulbs 1. qualitatively (by examining their brightnesses) 2. quantitatively (by calculating the power consumed in each bulb), using P = V I . 1

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II. Equipment 1. Vernier Printed Circuit Board (PCB) with resis- tances, battery pack, and light bulbs installed. (Many other devices are on this PCB which we will not use.) 2. Voltmeter - to measure voltage between two points. Put the red(+) probe at the ﬁrst position and the black(-) probe at the second position indicated when taking measurements. 3. Two larger alligator clips and cables (one black; one red) for use as probes to measure voltages. 4. Ammeter - to measure current through a circuit. 5. Various colored small alligator clips and cables - for making electrical connections forming the circuit. The PCB has the following labels on it that we will be using : 1. Positions (labeled 1, 2, 3, etc.) between which con- nections will be made using the smaller alligator clips and between which voltage measurements will be made using the larger clips. 2. Resistors (labeled R1, R2, etc) with their accepted values of resistance. (Example: R1 is 10 Ω and lies between positions 2 and 3.) 3. Lamps (labeled LAMP1, LAMP2, LAMP3), rather, small light bulbs. (Example: LAMP1 lies between po-
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Plab13 - Lab 13 Circuits Series and Parallel Ohms Law and...

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