tutorial_potential_difference

# tutorial_potential_difference - A model for circuits part 2...

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A model for circuits part 2: Potential difference I. Using the CCK simulation The Circuit Construction Kit (CCK) accurately simulates the behavior of electrical circuits. Hints for use: Right-click on the circuit element to change a property (e.g. resistance) or to delete it. Right-click on junctions to disconnect pieces. Familiarize yourself with the simulation by building the circuit shown at the right. (Keep the default values for battery voltage and bulb resistance) A. What do the blue dots in the simulation represent? Explain your reasoning. B. On the circuit diagram (above) indicate the direction of the current flow (as defined by convention) and the direction of the actual electron flow. II. Potential difference in series and parallel A. Assemble (or keep) the single bulb and battery circuit from part I, above. (Again, keep default values for light bulb resistance and battery voltage). Use the voltmeter to measure the potential difference ( V ) across the battery. Here and throughout the tutorial, record only the magnitude of the potential difference (omit +/- signs). Make a similar potential difference measurement across the bulb and across each length of wire. With the non- contact ammeter, measure the current through the bulb, i Bulb . How does the potential difference across the battery compare to the potential difference across the bulb? CCK Sim Tutorial, version 1.0 (10-11-2007) 1 measurements: V Bat V Wire A V Bulb V Wire B i Bulb

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B. Set up the circuit containing two bulbs in series as shown (again using default values for bulb resistance and battery voltage). 1. Before making any measurements , rank from largest to smallest the currents through bulb 1, bulb 2, and the bulb in the single-bulb circuit from part A ( i Bulb 1 , i Bulb 2 , i single ). Also rank the bulbs brightness from brightest to dimmest. Explain your reasoning. 2. Measure the potential difference across each element, and complete the table at the right. 3. Given these measurements, consider what would happen if the resistance of bulb 2 ( R 2 ) were decreased. Completing the following tables, predict whether the following quantities would increase ( ), decrease ( ), or stay the same ( ), as R 2 is decreased . Predict what happens to the current through the battery and the potential difference across the battery as R 2 decreases. Given this prediction, predict what happens to the current through bulb 1, the potential difference across bulb 1, and the brightness of bulb 1 as R 2 decreases.
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