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P7: Quiz 9

P7: Quiz 9

*Click here for a printable PDF of the graphs in this quiz.*

1) What is the calculation for finding total resistance in a circuit?

2)

a) For series circuits, does adding more identical resistors increase or decrease the total resistance of the circuit?

b) For parallel circuits, does adding more identical resistors increase or decrease the total resistance of the circuit?

3) This question is about investigating how the total resistance of a series circuit changes with the number of identical resistors.

a) Draw a diagram of the circuit that we would use to measure the total resistance in a series circuit for 2 identical resistors. Assume that we know the potential difference of the power source (which can be a cell or battery).

b) Explain how we can investigate how the total resistance of a series circuit is affected by the number of identical resistors.

c) On the graph below, draw how the total resistance of a series circuit changes with the number of identical resistors.

4) This question is about investigating how the total resistance of a parallel circuit changes with the number of identical resistors.

a) Draw a diagram of the circuit that we would use to measure the total resistance in a parallel circuit for 2 identical resistors. Assume that we know the potential difference of the power source (which can be a cell or battery).

b) Explain how we can investigate how the total resistance of a parallel circuit is affected by the number of identical resistors.

c) On the graph below, draw how the total resistance of a parallel circuit changes with the number of identical resistors.

5) Let’s suppose that we did not know the potential difference of our cell or battery. Describe how we could modify our circuits to find the potential difference of the cell or battery. Feel free to draw a diagram.