Tuesday, January 18, 2011

Hello my fellow classmates. I am back to compensate for yesterday's scribe. During yesterday's lesson, we had watched a video on electromagnetic induction and alternating current. Along with that video, we were given questions to answer while watching the tape. I will attach a link to the question sheet and the answers to it at the end of this post. After watching the video, we were given 3 other hand-outs called "Transparency 25-3," "Transparency 25-4," and "Transformers." If you missed those hand-outs, please see Ms. Kozoriz for them.

We also discussed about some interesting news about our province has been selling hydro to the U.S.A. This connects to the topic of Alternating Currents (AC) where it can be transported over large distances/areas. Our province has been earning a large amount of profit from selling hydro to America.

Anyways, here is the video question sheet for those of you who didn't receive a copy.

ELECTROMAGNETIC INDUCTION/ALTERNATING CURRENT VIDEO WORKSHEET:

Here are the answers for the questions:

ELECTROMAGNETIC INDUCTION:

1.) A flow of current for a magnetic field

2.) Hans Christian

3.) Michael Faraday

4.) No

5.) First electric motor

6.) When there is a change in the magnetic fields

7.) F = Bqv (F = Force, B = Magnetic field, q = charge, v = velocity)

8.) Loop moves away from current, loop moves towards current, magnet moves away from current, magnet moves towards current

9.) Yes

10.) Number of field lines per area

11.) Zero

12.) Phi

13.) Yes

14.) Yes

15.) Current induced creates a magnetic field of it's own

16.) Yes

17.) Change the magnetic flux

18.) Electricity and magnetism

ALTERNATING CURRENT:

1.) Emigrated from Eastern Europe, he knew 12 languages

2.) Moving back and forth

3.) Alternating current

4.) Direct current, Thomas Edison

5.) He invented the phonograph, motion picture camera, and telegraph

6.) AC can be transported over large distances

7.) A small current, large voltage

8.) Using transformer to send power to large distances

9.) Raises and lowers voltage

10.) Yes

11.) Heat, distance, current small, voltage high (I^2 x R OR P^2 x R/V^2)

12.) Generators are needed for far distances

13.) Edison didn't like Tesla

For those of you who missed some of the answers, here you are :)!!! If there are any mistakes, please correct it by leaving a comment. If you are unsure about the answer, please see Ms. Kozoriz.

As for the whole class, not much was taught yesterday. For those who were absent, you didn't miss anything important. Remember to study for our physics exam that is in 13 days!!! Our next test will be on Monday, January 24, 2011. So get ready to do some studying!!! Thanks for reading my post :), hope you all have a great night!!!