evidence of soldering

manga 156-195

1. What is an example of a semiconductor device?

Diode



2. Why is silicon used in the manufacture of semiconductors?

a silicon crystal does not have electrons that can move freely so electricity hardly passes through it



3. Discuss the difference using an example of the difference between and N-type and P-type semiconductor.

n types have no holes and negative charge while p have a a whole for valence electrons

in p types the whole becomes the carrier of electricity


4. In your own workd describe what a dioode does and the role of N and P type semiconductors.

diodes are a p type and n type semiconductor combined to make a p n junction,

they attract each other and allow current to flow in only one direction



5. What is rectification?

allowing current to flow in only one direction



6. What causes color in an LED? Give and example of what causes a particular color.

electrons and holes join near the pn junction and vanish the energy that is produced causes color in the led. wavelength controls the color,

white light - phosphor down-conversion1 is most commonly based on a blue or near-ultraviolet emitting die that is combined with a yellow-emitting phosphor,

7. What is the relationship between base current and collector current in a transistor?

electrons in connector are drawn to positive poles where they acmalate while electrons in the emitter the negative and accumulate to the base.



8. What are the advantages of a transistor over a switch?

transistors require no contact so it can be fined tuned and better controlled, less likely to fail

manga 90-116

What is the relationship between heat and electricity. Please provide a metaphor.

elelectricity genrates heat bc the atoms that make up a substance are always vibrating. Temperature correspond to how fast atoms vibrate. Thus electrical wire is used to flow electrons bc it has little resistance making its temperature near a state of rest.

Why is it warm near an incandescent light bulb?

light emission due to thermal emission mostly ends up becoming heat

What is a superconductor? What are they used for in real life? You may have to look this up. How could one make a metal a superconductor?

superconductor is a material that has zero electrical resistance due to being below a critical temp (close to absolute zero) 

They can be used in MRIs or particle accelerators. lower temperature.

What is Ampere's Law?

magnetic fields create a circular pattern around wire if you point your right thumb in direction of current your fingers curl in direction of magnetic field is generated


If current of the same size flows in the same direction in two electric wires placed side by side, what happens?

2 magnetic fields are combined to one big magnetic field, s force of attraction causes the the two wires to attract each other


What happens if current of the same size flows in opposite directions in two electric wires placed side by side?

force of repulsion causes two magnetic waves to negate each other

ch 3.5, 3.6

DIY Potentiometers

1.  

- 24mm body

- carbon element, not sealed

- below 5$

- not an upgrade compared to others

2.

- looks like standard but cost 10$

- low friction

- otherwise not much different than standard besides logo

3.

- sealed

- conductive copper element 

- cost the same a EVH but offers more

4. 

-other than look not much different than 82 vintage

Skycraft Supplies List

LEDs: 2 volt, Red, Green, Yellow, Reversed Polarity

Capacitors: DC capacitor, 7 MED

Solar Panels: Solar Cell Module, Trickle Charger

Breadboard:

5 sensor devices:

6 kinds of cables: Throttle, Light Source Fiber, RG 59, Assorted BNC, RG-142, V- male, Push on BNC

Electronics Kit. It has many electronic components to use:

Solderable perf board:

5 motors: 120 VAC Gear Head, VAC Gear Motor with Buff cap, Z- Amp, Exhaust Fan, C-frame (geared), Reversing

3 cameras or optics:

3 devices that produce sound:

Strobe light:

5 potentiometers: 1000 k ohms, 2000 k ohms, 2500 k ohms, 1.5 k ohms, 5 k ohms

5 switches: NC switch(red), RF switch(white), 8 level dip switch(red/white), locking switch (red/silver), slide switch

2 speakers:

3 project boxes:

3 magnets:

counting device: Frequency meter

LCD panel: LCD display

6 interesting things:

Cool sensor work

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