lab30 - Lab #30; Series and Parallel Circuits Introduction:...

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Lab #30; Series and Parallel Circuits Introduction: We commonly wish to connect several electrical components to a single source of potential difference. Such a connection can be made in two distinct ways, which are called "series" and "parallel". In a series connection, components are connected one after another, and each has the same current flowing through it as all the others. In a parallel connection, components are connected side by side and each has the same potential drop across it as all the others. In this lab we will explore measurements of current and potential difference in simple circuits, and 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. Apparatus: A connection board ("breadboard") with 6 light bulb sockets, several plug-in connecting wires ("banana plug leads"), an ammeter, a voltmeter, a variable voltage supply set for 5 Volts output. The tutorial on the computer “Lighting up Circuits”. Procedure: If you have never used circuits go to the tutorial “Lighting up Circuits” & practice. See the drawing of the breadboard Fig. 1. Use these to sketch your proposed circuits before you connect them up. Have your instructor approve the sketches before trying out the circuit. When you are building a circuit, be sure the power supply is turned off the whole time, until you are ready to measure. Use only the plug-in connecting wires supplied. If you need more wires, ask your instructor. When connecting the voltmeters and ammeters, start out by setting the instruments to their least sensitive on-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
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lab30 - Lab #30; Series and Parallel Circuits Introduction:...

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