Light Sensor application of Electronics
Electronics is the part of physics that
studies the movement of electrons.
Electric Current
Movement of electrons is current.
So, current is the movement of millions
of electrons through a conductor or wire.
A Lamp Battery
Inside a battery, the terminals are made
of different elements- zinc and carbon
respectively.
They are separated by a chemical that
allows electrically charged atoms to
move through it.
Voltage
A battery produces a voltage.
The voltage will cause the electrons to
flow from the negative terminal to the
positive terminal.
Electric Current
The flow of electrons is called the
current.
When a bulb is attached to the battery,
electrons flow from the negative
terminal through the bulb to the positive
terminal of the battery.
Current Loop
All circuits must have the current flow in
a complete loop.
If you start from one terminal you should
be able to trace all the way around the
wire and end at that same terminal.
Questions to Think About
1. When you connect a lamp or any
conductive material across the terminals of a
battery, electrons will flow from the ________
to the _______ of the battery.
2. This flow is called the electric __________?
Solderless Circuit Board
You will be given a solderless circuit
board.
Notice that there are many tiny holes on
each board.
Solderless Circuit Board
Each hole will accept a wire or lead.
All the holes on the very edge go across the
board horizontally.
All the holes in the center of the board go
across vertically. This means that each vertical
group is shorted together.
Solderless Circuit Board
A center channel divides the circuit board in
half.
This means the numbered rows that are
grouped vertically only go on each half.
Integrated circuits are meant to straddle this
channel.
Light Sensor kit
Each lab kit talks about a procedure and
introduces the theory of the circuit.
It gives you an appearance of a new
component and its schematic symbol.
Lab Kits
1. Your objective for each kit is to read
through the purpose and theory- don’t skip
this part.
2. Draw the circuit schematic. This will help
you become familiar with how to read them.
3. Build the circuit following the steps.
Don’t forget to read operating instructions.
4. Write down the results and observations
in your own words.
Time for sign off with me
I’m looking for three things:
1. schematic diagram
2. results of observation
3. I need to see it actually built
Your Objective is to Create a Light
Sensor from this list of materials.
9V battery
Photo Cell Resistor
Symbol
Part
LED
Your Objective is to Create a Light
Sensor from this list of materials.
9V battery
Photo Cell Resistor
Symbol
Part
Parts->
Symbols->
LED
Your Objective is to Create a Light
Sensor from this list of materials.
Photo Cell Resistor
Symbol
9V battery
LED
For a challenge add a switch.
Then measure the current with Amp meter.
9V battery
Photo Cell LED Amp meter Switch
Answer to the Challenge problem.
How to measure the current with a
Amp meter.