Transcript Year 10 Electronics unit pp

ELECTRONICS
WHAT DOES ‘ELECTRONICS’ MEAN TO
YOU ?
What are the inputs and the outputs?
Check out the inputs on this formula one race car
This is the output from this
CNC machine
Hot water system
• What is the inputs and the output
What controls the temperature
of the water?
What would happen if we had
no control over the temperature?
Solar Hot Water system
• What controls this system?
Automatic doors
• Automatic Doors are also a system.
• What are the inputs and the outputs
Inputs?
Outputs?
ELECTRONICS
• The basis of
electronics is the
controlled
movement of
electrons through a
circuit, usually
consisting of a power
supply, circuit board,
wires, and a series of
components.
BATTERIES are used in a wide range of applications and
come in a diverse range of size and shape
BATTERIES
Batteries provide the force to create the flow of
electrons ( I, current ) in most small circuits.
A battery can be compared to a water pump that
forces water through a pipe.
The pressure of the pump can be compared
to voltage ( V ) of a battery.
(BLACK)
(RED)
BATTERY SYMBOL
RESISTORS
• Resistors reduce the
amount of current flow in
a circuit, and is similar to
kinking a hose - it reduces
the flow of water.
• Resistor come in many
different values
(measured in OHMS, Ω)
The higher the value the
more the current flow is
reduced.
RESISTORS
The coloured stripes on a resistor
indicate its value
RESISTOR SYMBOL
4K7
RESISTOR COLOUR CODE
Resistors also come in a variety of sizes and
types.
L.E.D (Light Emitting Diode)
L.E.D.s are used in
place of small light
bulbs.
They use less
power, cost less,
and last for 50,000
hours (approx)
L.E.D (Light Emitting Diode)
• An L.E.D. is a special type of diode that gives
off light. As it is a diode it only conducts electricty
in one direction and it has to be inserted the right
way round. (Polarity)
The short leg is the Negative leg.
L.E.D SYMBOL
TRANSISTOR
A Tansistor is used as an amplifier
or a switch.
It uses a very small current to then
‘turn on’ a larger, more useful
current, which can be used to then
power a light or a speaker.
C
B
TRANSISTOR SYMBOL
E
Transistors also come in a variety of sizes and
types.
Circuit Diagram
R1 56ohm R2 10Mohm
Printed Circuit Board (PCB)
Usually a fibreglass panel that
has a copper
coating. This
copper coating
is sreen printed
and then acid
etched to form
tracks through
which electricity
can flow.
The various components and wires are inserted
through the holes and soldered into place
Now its over to you
• Explain how the touch torch circuit works
• What is the control in the circuit
• Describe how the control system makes
the torch better, what if it wasn’t there?
• Draw the circuit diagram using
conventions
• Explain what each part is and what it does