2.
Draw and label the current through each wire on the circuit diagram.
Use
conservation of charge to determine how these currents are related.
3.
Using your circuit diagram follow an energy carrier (say a positive charge) from the
battery around a complete circuit back to the battery.
Use conservation of energy to
write down an equation (or equations) relating the voltage differences across each
bulb. You may need to consider more than one path for the charge to take.
4.
Write down equations relating the voltage difference across each bulb to the current
through that bulb using Ohm’s law as an approximation
5.
Using the equations from questions 2, 3 & 4; can you solve for the current through
the battery?
If not, find a different path around a complete circuit and write down
the voltage equation for that path.
Continue this process of choosing paths and
writing down voltage equations until you have enough equations to solve for the
current through the battery.
6.
How is the brightness of a bulb related to the rate of energy transferred to the bulb?
Write down an equation showing how the current through the bulb determines its
brightness. Write down an equation showing how the voltage across the bulb
determines its brightness.
7.
Draw a wire between point 1 and point 2.
How does the voltage across each bulb
change?
How does this voltage change affect the brightness of each bulb?
8.
Now repeat questions 2 and 3 with this new circuit.
9.
Repeat the above steps for the other short circuit configurations described in the
Prediction section.
P
REDICTION
Determine the brightness of each of the bulbs when a wire is attached from point 1 to
point 2 by calculating the current through each bulb in terms of the battery voltage and
bulb resistance. Calculate the current output by the battery as a function of the battery
voltage and bulb resistance.
Determine the brightness of each of the bulbs when a wire is attached from point 2 to
point 3 by calculating the current through each bulb in terms of the battery voltage and
52
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SHORT CIRCUITS – 1202Lab2Prob5
bulb resistance. Calculate the current output by the battery as a function of the battery
voltage and bulb resistance.
Determine the brightness of each of the bulbs when a wire is attached from point 1 to
point 3 by calculating the current through each bulb in terms of the battery voltage and
bulb resistance. Calculate the current output by the battery as a function of the battery
voltage and bulb resistance.
Determine the brightness of each of the bulbs when a wire is attached from point 2 to
point 4 by calculating the current through each bulb in terms of the battery voltage and
bulb resistance. Calculate the current output by the battery as a function of the battery
voltage and bulb resistance.
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 Fall '17
 Aaron Wynveen
 Physics

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