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Name: Lab Partners:
Date:
Homework
Fundamentals of Circuits II:
Currents & Circuits
- Which of the three circuits shown below, if any, are the same electrically? Which are different? Explain your answers.
(a)
(b)
(c)
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- If a battery were connected to each of the resistor networks shown below, for which network would the current through the battery be smallest? For which would it be largest? Assume all of the resistors below have the same resistance. Explain your reasoning.
(a) (b) (c) (d) (e)
- Rank the resistor networks of question 2 in order from largest resistance to smallest
resistance. Explain your reasoning.
- Consider the two messy circuit diagrams #1 and #2 below.
−
−
(a) Identify which of the neat circuit diagrams (A, B, C or D) corresponds to circuit #1. Explain the reasons for your answer.
A
−
B + − C + −
D
−
(b) Which circuit diagram (A, B, C or D) corresponds to circuit #2. Explain the reasons for your answer.
- Three of the circuits drawn below are electrically equivalent, and one is not.
fuse
(a) What happens to the current through the fuse when more appliances are added to the circuit?
(b) Does the current through appliance #1 change when appliance #2 is turned on?
(c) Is this model consistent with your observations of electricity in your household? For example, does the brightness of one light bulb change when another is turned on?
(d) What may happen to the fuse if too many appliances are added to the circuit?
(e) What kind of circuit connection for appliance 1, 2 and 3 is shown in the diagram?
- Consider the circuit shown below Rank the brightness of the bulbs. Use the symbols <,
, and = to identify less bright, brighter, and equal brightness. Give physical reasoning to justify your answer.
−
A
B
C D
- In the two circuits below, the batteries and the resistors all are identical. Compare the current in the circuit on the left to the current in the circuit on the right. Be quantitative- give the ratio of the currents in the two circuits.
A B
