So, for WTP EE class, we have them use this kit, but today I saw a kit at Radioshack is that pretty much just as good, if not better, and is less than half the price. Wow. In fact if you wanna learn some EE, I recommend this kit.
Showing posts with label wtp. Show all posts
Showing posts with label wtp. Show all posts
Sunday, July 13, 2008
Electronics Kit
So, for WTP EE class, we have them use this kit, but today I saw a kit at Radioshack is that pretty much just as good, if not better, and is less than half the price. Wow. In fact if you wanna learn some EE, I recommend this kit.
Sunday, June 29, 2008
WTP
the Women's Technology Program has now started. i'm an EE tutor. it's been pretty busy already. i made congee this morning, though.
Wednesday, June 18, 2008
Power Electronics Lecture
There are 3 EE tutors, and I am one of them. We are each doing a lecture. I'm going to do one on power electronics. I will probably just talk about transformers. I only have 20 min, though.
First, I'd probably talk about what power converters do to give them an overview of what is power electronics.
There's AC/AC, AC/DC (wall-warts), DC/DC (computer supply), DC/AC (not sure when this happens).
Transformers are useful for all types of power converters, but most obviously, AC/AC.
A transformer is two inductors that share magnetic flux.
ok ok ok, let's look at one inductor first. Besides the electrical behavior of an inductor, it also produces a magnetic field so that it looks like a magnet.
If you put two inductors close together like this, they share magnetic field, and the magnetic field created in one induces current in the other.
What is the math behind all this? V = L*di/dt
Faraday's law of induction states that V = N * dPhi/dt where Phi is magnetic flux.
In order to maximize the current induced in the other, we want to maximize the amount of magnetic flux that flows through the second inductor. We do this by wrapping the inductors around certain materials.
All materials have a magnetic permeability. The permeability of air is low and is almost the same as the permeability of a vacuum, which is referred to as the permeability of free space.
Iron has high permeability, so ferrite is often used in transformers.
It depends how they are wound, but in the most general configuration, the turns ratio dictates the relative voltages and currents. Vs = Vp*Ns/Np and Is = Ip*Np/Ns
First, I'd probably talk about what power converters do to give them an overview of what is power electronics.
There's AC/AC, AC/DC (wall-warts), DC/DC (computer supply), DC/AC (not sure when this happens).
Transformers are useful for all types of power converters, but most obviously, AC/AC.
A transformer is two inductors that share magnetic flux.
ok ok ok, let's look at one inductor first. Besides the electrical behavior of an inductor, it also produces a magnetic field so that it looks like a magnet.
If you put two inductors close together like this, they share magnetic field, and the magnetic field created in one induces current in the other.
What is the math behind all this? V = L*di/dt
Faraday's law of induction states that V = N * dPhi/dt where Phi is magnetic flux.
In order to maximize the current induced in the other, we want to maximize the amount of magnetic flux that flows through the second inductor. We do this by wrapping the inductors around certain materials.
All materials have a magnetic permeability. The permeability of air is low and is almost the same as the permeability of a vacuum, which is referred to as the permeability of free space.
Iron has high permeability, so ferrite is often used in transformers.
It depends how they are wound, but in the most general configuration, the turns ratio dictates the relative voltages and currents. Vs = Vp*Ns/Np and Is = Ip*Np/Ns
Ice Breakers
This week, training for the Women's Technology Program has started. The girls arrive in two weeks. I've been brainstorming ideas for ice breakers. If it were up to me, here's what I would do.
1. have them smash ice in a bucket.
2. hold a spelling bee with people's names
3. say two things that are true about yourself and one thing that is a lie
4. get into groups and talk about your favorite foods
5. step aerobics
hahaha
1. have them smash ice in a bucket.
2. hold a spelling bee with people's names
3. say two things that are true about yourself and one thing that is a lie
4. get into groups and talk about your favorite foods
5. step aerobics
hahaha
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