Add another bulb of the same type in series as shown. BEFORE you close the switc

Question

Add another bulb of the same type in series as shown. BEFORE you close the switch, use your model for electric current to predict the relative brightness of the bulbs. Write your predictions down. Do you expect the brightness of bulb A to change? 1. Now close the switch. How does the brightness of bulb A change, if at all, when another bulb is added to the circuit in series with it? Add a third bulb of the same type in series as shown. Write your prediction of the relative brightness of the bulbs BEFORE you close the switch. 1. Now close the switch. How does the brightness of bulb A here compare with its brightness in a single-bulb circuit? How does it compare with its brightness in a two-bulb circuit? 2. Do you think a bulb may have current through it, yet be too dimly lit for you to see it? In this set of experiments, you have observed what happens to an indicator bulb as more bulbs are added in series to the circuit. Answer the following questions based on your observations, and discuss your results with your teacher. 1. What can you infer about the current through the indicator bulb (and hence through the battery) as each bulb is added in the circuit? 2. We may think of a bulb as presenting an obstacle, or resistance, to the current in the circuit. Thinking of the bulb in this way, how would you expect the total obstacle to the flow, or total resistance, to be affected by the addition of more bulbs in series? 3. Summarize the results of this experiment as a rule that you can include in your model for electric current. The rule should allow you to predict whether the current through the battery increases or decreases as the total resistance in the circuit is increased or decreased.

Explanation / Answer

1)

current decreases as each bulb is added

2)

total resistance is increasing every time we add a ne bulb

3)

as the resistance of the circuit increases current decreases

or

at constant voltage current is inversely proportional to resistance

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