Fundamentals of Circuits I: Current Models, Batteries & Bulbs

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Fundamentals of Circuits I: Current Models, Batteries & Bulbs v 0.1 Current 2 (A) Current 1(A) Time (s) Step 3: Zero the probes with the switch open. Step 4: Set up the circuit in Fig. 8 with the terminals marked + and − as shown. Begin graphing, and try closing the switch for a couple of seconds and then opening it for a couple of seconds. Repeat this several times while you are graphing. Sketch your graphs on the axes above. Note: You should observe carefully whether the current through both probes is essentially the same, or if there is a significant difference (more than a few per cent), and whether it is positive or negative. Question 1.16 How could you determine if an observed difference in the currents read by the top and bottom current probes is real or if it is the result of small calibration differences in the current probes Question 1.17 Did you observe a significant difference in the currents at these two locations in the circuit, or was the current the same Question 1.18 Based on your observations, which models seems to correctly describe the behavior of the current in your circuit. Explain carefully based on your observations. PHYS-204: Physics II Laboratory 11
Fundamentals of Circuits I: Current Models, Batteries & Bulbs v 0.1 Investigation 2: Using electric circuit symbols Representing electric circuits by drawings, like Fig. 5, can be very tedious. It can also be confusing for circuits that have many components. To make it easier to design electric circuits standard symbols have been established to represent the various components that make up an electric circuit. A few of these are shown below. More will be introduced in future experiments. V = 1.5V S + − Battery Switch R I Bulb Figure 9: Circuit Elements Wire Activity 2.1: Drawing circuits Question 2.1 Draw the circuit represented by Fig. 5 using the symbols above. Question 2.2 On the battery symbol, which line represents the positive terminal-the long one or the short one (Note: you should try to remember this convention. There are many situations in which it is important to distinguish the positive and negative terminals.) PHYS-204: Physics II Laboratory 12
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Fundamentals of Circuits I: Current Models, Batteries & Bulbs

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