lab_30

# lab_30 - Lab#30 Series and Parallel Circuits Introduction...

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Lab #30 Series and Parallel Circuits Introduction: An electrical circuit is a continuous path or array of paths through which an electrical current can flow. The two different ways in which components of a circuit can be connected are called "series" and "parallel". In a series connection, components are connected one after another; therefore, the same current flows through all of them. In a parallel connection, the circuit components are connected side by side. That is, the positive and negative sides of each component are respectively connected together; therefore, each has the same potential drop across. In this lab, we will explore measurements of current and potential difference in simple circuits. Also, we will attempt to verify the textbook expressions for the equivalent resistance of components connected in series and in parallel, and for the power dissipation in a resistive load. For instance, for a circuit consisting of any three resistance values R 1 , R 2 , R 3, the equivalent resistance in series R s and in parallel R p are, R S = R 1 + R 2 + R 3 + … + R N (1) and 1/ R P = 1/ R 1 + 1/ R 2 + 1/ R 3 + … + 1/ R N , (2) respectively. Apparatus: A connection board ("breadboard", see figures 1 & 2) with 3 resistor sockets, a multimeter with ammeter and voltmeter, and a variable voltage supply set for 10 Volts output. Procedure: When you are building a circuit, be sure the power supply is turned off the whole time, until you are ready to take measurements. Use only the plug-in connecting wires supplied. If you need more wires, ask your instructor. When connecting the digital multi-meters (DMM), start out by setting the instruments to their least sensitive scale. You may switch to a more sensitive (smaller value) scale to get a more precise reading. For example, suppose you have found a voltage to be around 5 Volts after measuring it with the DMM set on a 200 Volt scale. To get a more precise reading, do not switch to a 2 Volt scale

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## This note was uploaded on 02/29/2012 for the course PHYS 227 taught by Professor Rabe during the Fall '08 term at Rutgers.

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lab_30 - Lab#30 Series and Parallel Circuits Introduction...

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