Video comprehension questions: What caused a $440 million tethered satellite to break free from the space shuttle during testing?



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Understanding: Electricity


VIDEO COMPREHENSION QUESTIONS:

1. What caused a $440 million tethered satellite to break free from the space shuttle during testing?

2. What were the two primary factors that caused the New York City blackout on July 13, 1977?

3. Seen from space, what is the brightest man-made spot on the planet?

4. How does a lineman's specialized suit protect him from electric shock?

5. How many amps does it take to stop a human heart?

6. How is electricity produced at Hoover Dam?

7. What purpose does Hoover Dam serve and when was it built?

8. What muscles are used in controlling a myoelectric arm?

DiscoverySchool.com

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Copyright 2001 Discovery.com.

Teachers may reproduce copies of these materials for classroom use only. See next page for answers.





Understanding: Electricity
VIDEO COMPREHENSION QUESTIONS AND ANSWERS:

1. What caused a $440 million tethered satellite to break free from the space shuttle during testing?

The tether wire holding the satellite broke free from the space shuttle because it generated so much electricity that a spark jumped from the wire to the satellite deployment system and burned through the wire.



2. What were the two primary factors that caused the New York City blackout on July 13, 1977?

The New York City blackout of July 13, 1977 was caused by lightning strikes that knocked out power lines north of the city and by malfunctioning backup equipment.



3. Seen from space, what is the brightest man-made spot on the planet?

The brightest man-made object seen from space is a resort in the middle of the desert known as Las Vegas, Nevada. A town with more light bulbs than people!



4. How does a lineman's specialized suit protect him from electric shock?

A lineman's suit is made of stainless steel, which conducts electricity much better than the human body. Since electric current always follows the path of least resistance, it flows through the suit rather than through the person.



5. How many amps does it take to stop a human heart?

It only takes one amp to stop the human heart.



6. How is electricity produced at Hoover Dam?

As in all hydroelectric plants, the power of falling water is converted to electricity at Hoover Dam. The falling water drives the blades of a spinning turbine, which causes a magnet to spin inside a coil of copper wires. The spinning magnet causes the electrons in the coil to move, creating a flow of electricity.



7. What purpose does Hoover Dam serve and when was it built?

Hoover Dam serves the electricity needs of more than one million people in three states: California, Nevada, and Arizona. The dam was built during the Great Depression of the 1930s.



8. What muscles are used in controlling a myoelectric arm?

The biceps and triceps are used to control the myoelectric arm.



DiscoverySchool.com

http://www.discoveryschool.com
Copyright 2001 Discovery.com.

Teachers may reproduce copies of these materials for classroom use only.


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