Circuits

Welcome back! I know the transition to online learning will be challenging but please let me know how I can support you. Together we will finish the school year well and be prepared for next year!

Here is your first assignment! I hope you enjoy it. We are starting off easy with a simple introduction to Circuits. You learned this in grade 9 but I think a refresher might be a good idea!

Click here for a summary of my approach to online teaching:

• https://www.youtube.com/watch?v=dQw4w9WgXcQ

Please watch this lovely video introducing circuits and Ohm's Law (first link) and read these notes (second link) on Ohm's law, conductors, insulators, and Power.

• https://www.khanacademy.org/science/physics/circuits-topic/circuits-resistance/v/circuits-part-1
• https://www.khanacademy.org/science/physics/circuits-topic/circuits-resistance/a/ee-voltage-and-current

Then, answer these questions:

• Click here for quiz

Remember the quiz will be CLOSED at 3:00pm tomorrow (Tuesday April 7th) and I will post the answers to the quiz at that time. Also a reminder that your mark can't go down so have fun with this and give it your best shot!

I hope everyone is safe and healthy! I am very impressed with the level of engagement so far - thanks for the hard work everyone and keep it up!

Today we are moving on to learn about Resistors. I'm sure you can guess that resistors resist the flow of current. However, there are two rules you need to know about how resistors ADD TOGETHER. There is one rule for resistors in SERIES and one rule for resistors in PARALLEL. Sometimes you will need to use both rules to solve a circuit!

Your assignment today is firstly to watch these two short videos:

• https://www.khanacademy.org/science/physics/circuits-topic/circuits-resistance/v/circuits-part-2
• https://www.khanacademy.org/science/physics/circuits-topic/circuits-resistance/v/circuits-part-3
• I strongly suggest taking notes during the videos!

Then, answer these questions:

• Click here for quiz
• There is a challenge question today! Put your thinking boots on :)
• Just like last time, the assignment will be closed tomorrow (Thursday) at 3pm. Let me know if you have any questions!

Happy Easter everyone! I hope everyone had a great long weekend with the lovely weather.

Today we have a short lesson on Power in circuits. There are 3 equations for power - each useful in different situations. For Total Power, it doesn't matter if resistors are in series or parallel - just add up the power from each resistor! You may have to find other values in the circuit (like I, V, or R) before you can find P.

Your Assignment:

• Please watch the video here (I suggest taking notes during the video, or at least write down the 3 equations):
  • https://www.khanacademy.org/science/physics/circuits-topic/circuits-resistance/v/electric-power
  • https://www.youtube.com/watch?v=WNPFyqkDn6Q (optional video with examples)
• Then, please complete the quiz here: https://forms.office.com/Pages/ResponsePage.aspx?id=RtUantX4ek-GDic4Z6NToHvA1yWui35JqXQhGpKbVXJUNjAzWkpZVVRENzZRSUlFQ0swNjhaOEFWNC4u
• The quiz will close at 3pm on Wednesday April 15th

Hello, I hope everyone is safe and healthy. I would consider this to be the most important part of the Circuits unit - Kirchoff's Laws. In this chapter, every circuit is like a puzzle. You must use the information you have to get to the information you want. There is almost always more than one correct path but some paths will be more efficient. Your tools to solve each puzzle are the Current Law, the Voltage Law, and Ohm's Law. Using these 3 things you can solve an infinite number of circuits problems!

Your assignment today

• Please watch these 2 videos
  • https://www.khanacademy.org/science/physics/circuits-topic/circuits-resistance/v/ee-kirchhoffs-current-law
  • https://www.khanacademy.org/science/physics/circuits-topic/circuits-resistance/v/ee-kirchhoffs-voltage-law
  • (Notes and practice problems if you want) https://www.khanacademy.org/science/physics/circuits-topic/circuits-resistance/a/ee-kirchhoffs-laws
• Then, please answer these questions. Make sure you understand HOW you got to the answer!
  • Click Here for Quiz
  • Note - Next week the quiz will NOT be posted here or emailed. It will be posted on MS Teams ONLY

Below are the regular notes and regular worksheet if you would like to use them as resources as well. I am not assigning the worksheet but this chapter gets much easier with practice so if you plan on doing engineering or sciences I would recommend practicing some of the problems.

Happy Monday everyone!

I hope everyone had a safe and healthy weekend. Today we are doing a second class on Kirchoff's laws and Circuit analysis because it is the most important topic in this unit and it also requires the most practice. It is certainly the most applicable skill for those of you who might apply this unit in the future.

Today:

• Please watch this great video on circuit analysis.
  • https://www.youtube.com/watch?v=-PiB2Xd3P94
  • I personally do not put the zero ohm resistor in but if it works for you absolutely do it
• Then, please answer the questions in your Assignment on MS Teams for today. Only 2 questions!
• Please respond to the poll in the "Chat Or Ask A Question" channel. I will post a question or a poll there.
• Progress reports will (finally) be sent out within a couple hours.

Thanks! If you have any questions please post them in the other "Chat Or Ask A Question" channel or message me directly through teams. I have the audio figured out for my screen recordings so I should be able to answer questions in detail if needed!

Circuit Analysis Quiz 2 Key (2 videos)

Here is the LAST NEW THING we are learning in the circuits unit! I will have a different type of assignment for you on Monday to finish off the unit.

Today we have a quick and easy lesson about how batteries work in real life. We have been pretending batteries are a perfect source of voltage but that is not actually true! Here is how batteries really work:

• Vterm = ε - Ir is the formula for terminal voltage.
  • Vterm = terminal voltage or the ACTUAL voltage supplied across the terminals of a battery
  • ε = emf which is the "ideal" voltage produced inside the battery. Still measured in Volts (V)
  • I = current through the battery
  • r = internal resistance of a battery. Must use lower case r.
    • You CAN add the internal resistance to the resistance of the rest of the circuit to find total current in the circuit.
• Basically, some of the voltage is consumed by the internal resistor before it even leaves the battery.
  • This leads to a slightly lower voltage being supplied to the rest of the circuit.
  • The higher the current, the more voltage is lost within the battery.

Please watch the following video for a good example: https://www.youtube.com/watch?v=R1QN_0fcZ_8

Then, please complete the quiz questions through MS Teams before 3pm on Thurs. April 23rd.

Vterm Quiz Key

Coming Thursday April 23rd at 3pm!

Today we are going to try something new - an online lab! This is using mostly things you already know, with the only new topic being voltmeters and ammeters (video coming soon).

Please read the instructions carefully and refer back to this video if you need help with the "solving" part of the lab. https://www.youtube.com/watch?v=-PiB2Xd3P94

This is also a learning experience for me (in terms of collecting photos as an assignment) so let me know if you have any issues with uploading the pictures and screenshots.

This assignment is due on MONDAY MAY 4th - 1 week from now. Don't leave it to the last day! Please shoot me a message if you have any feedback or questions about the assignment.