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P155. Electrostatics and Circuits Review Problems

Write your solutions as directed.


These two problems are required.

Problem 1

Problem 2

In the circuit shown to the right, R1, R2, and R3 represent three bulbs, each rated at 12 W, 6.0 V. The circuit is connected across a battery of Vb = 6.0 V. Assume that the resistances of the bulbs are constant and that the resistances of the wires and the battery are negligible.

  1. Determine the resistance of each bulb.

  2. Determine the amount of charge that passes through the battery in 30. s.

  3. Suppose you have two multimeters to simultaneously measure the current in R1 and the potential difference across R1.  Redraw the circuit, showing how the meters are connected to the circuit. Use the following symbols to represent the multimeter that measures current (A) and the multimeter that measures potential difference (V).

  4. Determine the potential difference across R2. First write in symbols the loop rule that applies.

  5. If R3 is disconnected, will bulb 1 become dimmer or brighter? Explain in sentence form without calculation.

  6. If you could rewire the 3 bulbs and the battery, how would you connect them so that they dissipated power at the greatest rate? Sketch the circuit and explain your answer.

  7. Suppose you are to test the assumption that the resistance of a light bulb is constant. Describe the measurements that you would take. Tell what graph you would plot and how you would interpret the graph in order to determine whether the resistance of the bulb was constant.

  8. The light bulbs are of the type that uses a tungsten filament which becomes hot enough to emit visible light. Provide evidence from your experimental and theoretical knowledge to make a reasonable hypothesis about the result of the experiment described in the previous part.

The following problems are recommended for review. Don't submit solutions.



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