can anyone tell me what part is this???

[rezash1390]

Hi
I received a HW from the teacher, asking to tell the name and usage of some parts.
but i couldn't find these parts anywhere!!! (I searched Google, really!)
can someone please tell me what parts are these?
1.

2.

3.

4..

4.

 

[duke37]

What is an HW?

I have not seen these symbols before with the squiggles.

1. A capacitor , possibly variable. Normally the capacitor has an arrow through it for variable or a long T through it for preset.
2. Light sensitive resistor?
3. Light emitting diode?
4. Light sensitive npn transistor?

What country are you in? Perhaps the symbols are used in your area only.

 

[shrtrnd]

Yeah, duke37 probably got them right. Maybe the teacher was being fancy with the
squiggles. Google 'electronic component symbols', there are plenty of sites that
give you schematic symbols. If you've got a printer, make a copy so you'll be ahead
of the teacher's next example.

 

[rezash1390]

Thanks duke37 and shrtrnd for replying.
I thought exactly the same that these symbols are fictional.
but as it was a homework I had to search and ask to be sure.

 

[(*steve*)]

If I was asked to come up with names for these ficticious looking components, I would say they are:

1) an adjustable Zener capacitor
This is used to provide a capacitor with an adjustable breakdown voltage.

2) a dark-emitting resistor
When power is applied, this device emits darkness. The symbol shows light rushing in to fill the dark void.

3) a light emitting unipole diode
This is a special two-terminal device with a single terminal. It is placed on the end of an antenna to show when electrons are travelling in a particular direction.

4) a thronomister
In conjunction with a phase detractor, this is an alternative for the adjustable dingle arm in a turbo entabulator.