Electricity Test

After you finish your Electricity Test today please pick up a final.

For your final:

• Exempt if we can put a zero in the gradebook for your finals grade and you still have an A
• Due dates:
• Period 5 & 6: Tuesday 5/20
• Period 1: Wednesday 5/21
• Period 4: Thursday 5/22 for juniors, Monday 5/19 for seniors
• On your actual finals day we'll watch a movie. To vote, take the online survey for your class period (the address is posted in the classroom)

Study Guide

Today and Thursday are work days to complete your work and study guide.  We also counted stamps.  Abridged answers to the study guide are below.

More Compound Circuit Practice

Today is our last bellwork and last worksheet together! I have video of the bellwork from last year. Homework is Electricity VII, due tomorrow, and the extra credit ranking tasks (due whenever).

Tomorrow I will pass out the study guide for your last unit test (which is Friday).

Compound Circuits Practice

Today on bellwork we learned a trick to solve a compound circuit when there is a junction where the current does NOT split evenly. This is kind of hard to explain in a picture, so I have a video from last year that uses the same trick to solve problem #2 on your homework, which is Electricity VI.

Here's the finished bellwork too:

Solving Compound Circuits

Today we finished or notes about solving compound circuits. I go through all of the procedure in a video from last year. Your homework tonight is Concept - Development 35-2.

Overload, Circuit Breakers, and Compound Circuits

Today we first talked about the purpose of a circuit breaker or fuse and how overload happens. Then we worked on Electricity IV (below) for a bit. If you didn't finish in class, that's homework.

Later we started talking about compound circuits and how to find their total resistance, but we are going to add to and finish those notes on Thursday so I'll post them then.

Review

Welcome back from Spring Break! Today we are reviewing series and parallel circuits. Your homework is Electricity V.

Series and Parallel Circuits

Today we named the two types of circuits you made yesterday in your lab: series and parallel. We went over the characteristics of each and did some math. Homework is Concept-Development 35-1.

Practice: Electricity III

Today we are just practicing some problems, first on bellwork and then with Electricity  III.

Electrical Power

POWER! Homework tonight is Concept-Development 34-2.

Ohm's Law

Today we talked about the results of your lab as well as how voltage might affect current. Putting those ideas together gave us Ohm's Law. Your homework tonight is Ohm's Law.
We also played with the PhET of Ohm's Law from the University of Colorado Boulder.

Ohm's Law Lab

Today you are completing a short lab to discover how resistance affects the current through a resistor. Your homework is to finish the analysis questions - you'll need graph paper!

Electricity Study Guide Answers

These are the answers for the Electricity Study Guide. The scheduled date for this test is Wednesday, but if you want to take it sooner you can.

Work Day: Electricity III

Today we just worked on Electricity III (below). I also printed out grade reports for you. If you get your grade report signed by a parent or guardian and then attach it to a late paper, I will waive the late penalty for that paper. It could also be a paper you have already turned in late and gotten back.

Ohm's Law

Today we talked about the results of your lab as well as how voltage might affect current. Putting those ideas together gave us Ohm's Law. Your homework tonight is Ohm's Law.

Ohm's Law Lab - Take Two

Okay, let's try this again. Today you are completing a short lab to discover how resistance affects the current through a resistor. Your homework is to finish the analysis questions - you'll need graph paper!

Unit 12 Review: Electricity

Here is the review for the LAST TEST OF THE YEAR! Yaaaaaay!

The page numbers correspond to the brown version of the textbook.
p.535
7. How many joules per coulomb are given to charges that flow in a 120 volt circuit?
16. Why is it that a bird can perch without harm on a high voltage wire?
22. Where do the electrons that flow in a typical electric circuit come from?
24. Which of these is a unit of power and which is a unit of electrical potential energy: a watt, a kilowatt, or a kilowatt-hour?
2. Ten coulombs of charge pass a point in 5 seconds. What is the current at that point?
3. A battery does 18 joules of work on 3 coulombs of charge. What voltage does it supply?
5. What is the effect on current in a circuit if both the voltage and the resistance are doubled? If both are halved? Explain.
10. How many amperes flow in a 60-watt bulb rated for 120 volts when it is connected to a 120 volt circuit? How many amperes would flow if it were connected to 240 volts?
p.549
2. Why are household appliances almost never connected in series?
6&7. Cannot reproduce here; involves finding the equivalent resistance and total current in two circuits.
10. Why should you not use a copper penny in place of a safety fuse that blow out (or a circuit breaker that is tripped)?

Compound Circuits Practice

Bellwork begins:

Finding equivalent resistance step by step:

Finding the total current and solving the circuit...you really needed to be there...

The rest of the period was spent finishing Concept-Development 35-2 (see previous post) and starting HW: Electricity V.

Note: on the back of the honors version, the 6 ohm resistor needs to be changed to an 8 ohm resistor. You're still going to get a lot of fractions, but it is doable!

Compound Circuits

Part of bellwork:

Another example of finding equivalent resistance:

One more example:



Homework:
Concept-Development 35-2 front
Concept-Development 35-2 back