Pre-LAB 4 Assignment Fundamentals of Circuits II: Currents ...

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Fundamentals of Circuits II: Currents & Circuits v 0.3 Prediction 3.2 Predict how the current through bulb B will change, if at all, when circuit 10(a) is changed to 10(b) (when bulb C is added in parallel to bulb B). What will happen to the brightness of bulb B? Explain the reasons for your predictions. Prediction 3.3 Also predict the relative rankings of brightness for all the bulbs, A, B, and C, after bulb C is in the circuit. Explain the reasons for your predictions. Activity 3.1: A More Complex Circuit Step 1: Set up the circuit shown in Fig. 11(a). Convince yourself that this circuit is identical to Fig. 10(a) when the switch, S, is open, and to Fig. 10(b) when the switch is closed. + − CP1 A A + − S + − + CP2 − S B C B C (a) (a) Figure 11: (a) Circuit equivalent to Fig. 10(a) when the switch, S, is open and to Fig. 10(b) when the switch is closed. (b) The same circuit with current probes connected to measure the current through bulb A (CP1) and the current through bulb B (CP2). Step 2: Observe the brightness of bulbs A and B when the switch is open, and then the brightness of the three bulbs when the switch is closed. Compare the brightness of bulb A with the switch open and closed, and rank the brightness of bulbs A, B, and C with the switch closed. Question 3.5: If you did not observe what you predicted about the brightness, what changes do you need to make in your original reasoning? Explain. Step 3: Connect the two current probes as shown in Fig. 11(b). Use same the experiment file L2A1-2 (Two Currents) that you have used in the previous activities. PHYS-204:Physics II Laboratory 18
Fundamentals of Circuits II: Currents & Circuits v 0.3 Step 4: Begin graphing and observe what happens to the current through bulb A (through the battery) and the current through bulb B when the switch is opened and closed. Question 3.5 What happens to the current through the battery and through bulbs A and B when bulb C is added in parallel with bulb B? What do you conclude happens to the total resistance in the circuit? Explain. This laboratory exercise closely follows the references below. PHYS-204:Physics II Laboratory 19
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Pre-LAB 4 Assignment Fundamentals of Circuits II: Currents ...

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