Activity: What effect do bulbs in the loop have on a circuit?

INVESTIGATION 1: What effect does the type of bulb have on a capacitor?

INVESTIGATION 2: What are the differences between the filaments of round and long bulbs?

1.Examine the round bulb filament under magnification. Describe the length, thickness and shape of the filament in the space provided:

2.Examine the long bulb filament under magnification. Describe the length, thickness and shape of the filament in the space provided:

3.How thick is the round bulb filament compared to the long bulb filament?

4.How long is the round bulb filament compared to the long bulb filament if both were uncoiled and straightened?

5.How thick are the filaments compared to the supporting wires in each bulb?

INVESTIGATION 3: How is air moving through straws analogous to charge moving through a filament?

Obtain a coffee straw, a soda straw and a paper towel tube and follow the instructions below.

INSTRUCTIONS: Take a deep breath and measure the time it takes to exhale through the soda straw. Now take a second, same deep breath and, using the same effort, completely exhale through the thinner coffee straw.

  1. Compare the amount of time it takes you to completely “discharge” your lungs by exhaling through each straw type.
  1. Do you exhale more air through either straw? Explain your reasoning.
  2. Repeat the previous actions, but blow onto the back of your hand. How does the speed of the air particles that strike your hand when using the soda straw compare to the speed of the air particles when using the coffee straw?
  1. The same amount of air is being ‘discharged’ from your lungs through both the coffee straw and the soda straw. What does this tell you about the number particles striking the back of your hand during each second for the coffee straw compare to the soda straw?
  1. Are the speeds and the number of particles per second consistent with one another?
  1. Now take the paper towel tube and, with the same effort from your lungs, exhale a full breath of air. How does the tube affect the time to exhale?
  1. How does it affect the flow of air from your lungs?
  1. Compare the times it takes to "charge" your lungs by inhaling through the straw, the stirrer and the paper towel tube.
  1. Considering your answers to the preceding eight questions, how would you answer the focus question: How is air moving through straws analogous to charge moving through filaments?

INVESTIGATION 4: What is the difference between flow rate and flow speed?

Imagine a stream with a constant depth but varying in width.

  1. How much water is in this stretch of river at any given moment?
  2. How does this amount of water change with time?
  3. How do the flow rates at compare positions 1, 2, and 3?
  4. How do the speeds compare of the water at positions 1, 2, and 3?
  5. What labels should be assigned to each quantity?

TO DO AS A CLASS:

Figure A Figure B

SIDE-BY-SIDEONE-AFTER-ANOTHER

The rules are:

1.You must be moving during the entire one-second count.

2.You must start moving when the counting starts and you must not stop until the counting has ended.

3.Your entire group must just finish crossing the line when the counting has ended.

QUESTION: What is the difference between flow rate and speed?

©Modeling Workshop Project 20071C3 ACT 1 v3.1