Power

Notes: Power!

Suggested homework: p. 162 #45, 50 (use Watts instead of horsepower), 56

Practice Time

The rest of the week is work time for you to finish all of your homework and to study for the test. You have one last homework, Electricity TIPERs #4, which is due tomorrow. The practice test was also available.

Electricity Test Practice
Key:

Here are some old solutions videos:

#6

#7

#9

#11

#13

#14

#15 (the reading HW I mention in the video wasn't done this year)

Your test is either Monday or Tuesday. You will have a little time to study before it starts.

Electrical Power

Today we talked about electrical power.

Notes: Electrical Power

Here is the setup for the practice problem:



Homework: Concept-Development 34-2

Energy Test Practice

First you voted on which of last night's homework to go through as a class. I may have asked a student to do the problem, depending on the class period (and if anyone felt comfortable enough to go up to the board). Then you started your practice test. Your test is next class, at the end of class, so you will have a little time to study beforehand. We'll also go over Energy TIPERs #7 very briefly at the beginning of next class.

Energy Practice Test

Here are some solutions videos from a couple of years ago (may not perfectly match energy practice test).

Multiple Choice #1
Multiple Choice #2
Problem #1
Problem #2
Problem #3

Below are the abridged answers.

Power

Notes: Power!

Here is the solution to the last example problem:

Homework: p. 162 #45, 50 (use Watts instead of horsepower), 56 

Practice Time

The rest of the week is work time for you to finish all of your homework and to study for the test. You have one last homework, Electricity TIPERs #4, which is due tomorrow. The practice test was also available.

Electricity Test Practice
Key:

Your test is either Monday or Tuesday. You will have a little time to study before it starts.

Power and Circuit Breakers

Today we talked about electrical power and circuit breakers.

Notes: Electrical Power

Here is the setup for the practice problem:

Homework: Concept-Development 34-2

Power

Notes: Power!

Here is the solution to the last example problem:

Homework: p. 162 #45, 50 (use Watts instead of horsepower), 56 

More Circuits Practice!

Today we just practiced yet more circuits! You do have some homework, though you probably finished them in class:

p.644 #37, 38, 40
Worksheet: Circuit Reduction Practice

There is also a worksheet, Circuit Practice, that is entirely optional. We don't even want you to turn it in. If you want even more practice, you can try these problems from the book: p. 641 #5, 6, 7, 8, 9, 10, 22, 44, 56, 64. Please do not turn these in; there is a key in the key binder to check your own answers.

Finally, you may have picked up your Electricity Practice Test today. I have some solution videos below and the abridged solutions are here.

Problem #2
Problem #3
Problem #5
Problem #6
Problem #7
Problem #9
Problem #10

Power and Circuit Breakers

Today we talked about electrical power and circuit breakers.

Notes: Electrical Power

Homework: Concept-Development 34-2 and the worksheet Series and Parallel Circuits

Power

Notes: Power!

Here is the solution to the last example problem:

Homework: p. 162 #45, 50 (use Watts instead of horsepower), 56 

AC/DC and Electricity Test Practice

PERIOD 1: We did what everyone else did Monday. You will also have tomorrow to work on Compound Circuits Practice and Electricity TIPERs #6.

EVERYONE ELSE: We talked for 5-10 minutes about the difference between alternating current (AC) and direct current (DC). There's a great explanation on MIT's Ask and Engineer.

I also told you the story of the battle between AC and DC when this country was first building its electrical infrastructure. SciShow has a nice video about Nikola Tesla that covers some of that. There is also an Epic Rap Battles of History and a Drunk History that tell the story, although not in a way that is school appropriate so we didn't watch those.

After that you started working on your Electricity Practice Test. I have some solution videos below and the abridged solutions are here.

Problem #2
Problem #3
Problem #5
Problem #6
Problem #7
Problem #9
Problem #10

Circuit Breakers

PERIOD 1: You are completing what everyone else did Monday.

EVERYONE ELSE: For bellwork today we asked which would cook faster: three hot dogs wired in series or three hot dogs wired in parallel? Then we tried it out. The answer was the parallel hot dogs because the power is greater (resistance is lower so current is higher).

We then talked briefly about circuit breakers, why we have them, and how they work. If you missed this the easiest way to get the information is to read section 18.6 in the textbook.

Homework tonight is Ch.18 (p.644) #37, 38, 40.

Electric Power

Period 1: See the second half of Monday's blog entry; you are behind because of AZMerit testing on Monday. Concept-Development 34-1 is your homework.

Everyone else:
When current flows through a resistor, the resistor converts electrical energy into other forms of energy. The rate at which this conversion happens is the electrical power. Below are some short notes that ended up on the whiteboard.

We then completed a worksheet in class (email miss.volkening@gmail.com for a copy) and started homework:

Ch. 17 (p.612) #33, 34, 44

Energy Practice Test

Today you were given a practice test for this unit. Your test is first thing next week.

Energy Practice Test

Here are the solutions:

Power

Our last topic for the unit is power.

Notes: Power!

Here is the solution to the last example problem:

Homework p. 162 #50 (use Watts instead of horsepower) & 56

Circuit Breakers

For bellwork today we asked which would cook faster: three hot dogs wired in series or three hot dogs wired in parallel? Then we tried it out. The answer was the parallel hot dogs because the power is greater (resistance is lower so current is higher).

We then talked briefly about circuit breakers, why we have them, and how they work. If you missed this the easiest way to get the information is to read section 18.6 in the textbook.

Homework tonight is Ch.18 (p.644) #37, 38, 40.

Electrical Power

When current flows through a resistor, the resistor converts electrical energy into other forms of energy. The rate at which this conversion happens is the electrical power. Below are some short notes that ended up on the whiteboard.

We then completed a worksheet in class (email miss.volkening@gmail.com for a copy) and started homework:

Ch. 17 (p.612) #33, 34, 44

Chapter 5 Practice Test

Today we simply practiced chapter 5 problems and admired each other's costumes. I also handed out the practice test:

Chapter 5 Practice Exam

Here are videos with solutions to the practice test:

#1
#2
#3
#4
#5

Your real test will be next Wednesday (and shorter than normal).

On Monday/Tuesday we will continue to work on the problems we started today. They are actually due at the end of class Monday/Tuesday, but you should do all you can this weekend and then get help on the rest during class:

Ch. 5 #2, 10, 11, 18, 20, 24, 38, 44, 45, 47, 53, 66, 68, 92

Power

Today's topic was power! There actually isn't much to say about power, so there were a few notes with several practice problems:

Power!

Any leftover time was spent starting homework or checking your labs from last week.

You have a test coming up next Wednesday.

Homework: Chapter 5 (p. 162) #50, 52, 56. Use watts, not horsepower on #50 part b.