What happens to the bulbs?
|In the figure at the right is shown an electrical network containing a battery with EMF = E, and three resistors with resistances R1, R2, and R3. All three resistances are identical and have a resistance R. In the circuit is a switch, which is open when we start. In addition, two points in the network are marked with dots and the numbers
"1" and "2".
- If the switch is open, rank the brightness of the bulbs.
- If the switch is open, calculate the current through the battery.
(Express your answer in terms of the symbols given.)
- If the switch is closed, what happens to the brightness of each bulb? (Increase, Decrease, Same)
Now rank the brightness of the three bulbs. Briefly explain your reasoning.
- If the switch is open and we connect the two terminals of an ammeter to the points 1 and 2,
what would happen to the brightness of each of the bulbs? (Increase, Decrease, Same)
Briefly explain your reasoning.
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Page last modified
October 19, 2002: E17