Last week we looked at using electricity to get things moving. We looked at examples of an electric bell and the movement of a current-carrying bar of copper in a magnetic field. We’ll be taking an electric motor apart this week to see how it works but in the meantime, here is a link to an animation of an electric buzzer (same idea as the electric bell).
If you want to read someone else’s explanation of how an electric motor works, you could go here or here. There are animations of a dc electric motor here and here (this is the example I used in class).
We have almost completed the Using Electricity unit. We will start looking at magnetism tomorrow as an introduction to movement from electricity. The closer we get to the end of a unit, the nearer we are to test time.
You might want to download a copy of this electricity revision booklet to help you check how well you understand the topics we have covered. It also contains some useful revision questions in the homework section.
We’ve been looking at the different properties of series and parallel circuits over the past week or so.Â Since there are only 91 days left until Christmas, I thought I would ask you all for some shopping advice.
I need a new set of Christmas tree lights.Â Should I be in the market for a set of lights built in series or parallel?Â Don’t forget to tell me what information influenced your choice!
If you want to read the text along the x-axis, just click on thisÂ pdf version of the traffic light chart. You will be able to zoom in using Acrobat’s zoom feature and read the full text label for each of the criteria (get Adobe Acrobat Reader here).
I will address the topics attracting the highest red scores first, so we will start with “know that the declared value of an alternating voltage is less than its peak value”. We will start a lesson with this topic in the next week.
We looked at the relationship between current, voltage and power in our last lesson. The good people at howstuffworks.com have an excellent page that summarises this topic – click here to check it out.
We had some discussion about the use of voltmeters and ammeters this week. I found this site tonight. It has information on several types of meter and is worth a look.