How does an Electric Motor Work?
Define the following terms:
Write a paragraph describing the following.
- a. Armature:
- b. brushes:
- c. Commutator:
- d. Axle:
- e. Windings:
- f. Battery Lead Cable:
- g. Permanent Magnet:
- h. Electromagnet:
- i. Wire gauge:
- j. Voltage:
- k. current:
Write a paragraph describing the following.
- a. Describe the electron motion around atoms in an element that shows magnetic properties
- b. Describe the electron motion around atoms in an element that does not show magnetic properties
- c. Describe how electricity produces an electric magnet
- d. Describe how moving a magnet past a wire causes electricity.
- e. Compare and contrast a motor to a generator.
- f. Describe the interaction between a permanent magnet and an electric magnet in our simple motors.
- g. Describe the function of a commutator. Exactly how does it work?
Interpretation of DATA for Electric Motors
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Scientific Investigation with Motors
For all of the following, assume the same process and procedure as used in the recent physics lab.
- a. Write a hypothesis for voltage as the independent variable.
- b. Sketch a general graph for the hypothesis in question a, assume realistic yet accurate data.
- c. Draw and label a lab setup for the experiment to measure voltage as the independent variable.
- d. construct a table and graph for an experiment where magnet distance was the independent variable. The magnetics were positioned at 60 mm in trial one and in each of the following 4 trials they increased the distance by 2mm. The following data was collected: Trial 1 - 345 rows with a starting time of .4 and ending time of 4.5 sec. Trial 2 - 340 rows with a starting time of .5 and ending time of 5.4 sec. Trial 3 - 330 rows with a starting time of .2 and ending time of 6.4 seconds. Trial 4 - 345 rows with a starting time of .6 and ending time of 7.8 sec. And trial 5 - 350 rows with a starting time of .3 and ending time of 6.8 sec.
- e. List three possible issues that might have "messed up" the last trial of the experiment.
- f. Provide quantitative evidence that supports a hypothesis stating that electric motor RPMs are inversely proportional to permanent magnet spacing.