PHY 221 Lab: Current and resistance C. In the prelab, you examined the circuit s

Question

PHY 221 Lab: Current and resistance C. In the prelab, you examined the circuit shown below right and were asked to consider how bulb B would be effected if bulb C were removed. No wire was put in its place. It was simply left open circuit. (If this is not perfectly clear, please ask you instructor about it.) It is difficult to answer this question by thinking only about the current. Write an equation that relates the potential differences across the battery, bulb A and Bulb B. Label these potentials Vhar, VA Ve respectively 1. 2. Before Bulb C is removed, is the potential difference across bulb A greater than, equal to or less than half the potential difference across the battery? Explain. 3. After bulb C is removed, is the potential difference across bulb A greater than, equal to, or less than half the potential difference across the battery? Explain. On the basis of your answers above, how will the brightness of bulbs A and B change when bulb C is removed? 4. If Bulb C is replaced with another bulb of 3 times the resistance of Bulb C, how will the brightness of bulbs A and B change? 5.

Explanation / Answer

1: both ckts consume the the same amount of current as E is a broken wire thus no current flow sthru it

2:current = V/R V is constant for all

now resistance in B is greater than in A thus current in A is greater than in B

3:no current flows in A+E ckt as the ckt is incomplete so current flowing thru A+E = 0

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