Transcript Electronic Components

Resistor
 An electrical component that limits or regulates the
flow of electrical current in an electronic circuit.
LED
Light Emitting Diode
 A light-emitting diode (LED) is a semiconductor
device that emits visible light when an electric current
passes through.
Photocell
 Component that varies in its resistance to the flow
of current as a function of the amount of light falling
on it.
Integrated Circuit (555 Timer)
 An integrated circuit (IC), sometimes called
a chip or microchip.
 A semiconductor wafer on which thousands or
millions of tiny resistors, capacitors, and transistors
are fabricated.
 An IC can function as an amplifier, oscillator, timer,
counter, computer memory, or microprocessor.
Battery
 A container consisting of one or more cells, in which
chemical energy is converted into electricity and used
as a source of power.
Speaker
 A transducer which converts electrical energy to
sound.
Potentiometer
 A variable resistor with a third adjustable terminal.
Diode
 A semiconductor device with two terminals, typically
allowing the flow of current in one direction only.
SCR Gate
 SCRs are unidirectional devices (i.e. can conduct
current only in one direction)
 SCRs can be triggered normally only by currents going
into the gate.
NPN Transistor
 Transistors can be regarded as a type of switch.
 They are central to electronics and there are two main
types; NPN and PNP.
 Most circuits tend to use NPN.
 Parts
 The BASE - which is the lead responsible for activating
the transistor.
 The COLLECTOR - which is the positive lead.
 The EMITTER - which is the negative lead.
PNP Transistor
 Positive Negative Positive
Ceramic Capacitor
 A fixed value capacitor in which ceramic material acts
as the dielectric.
Electrolytic Capacitor
 A type of capacitor that uses an electrolyte to achieve a
larger capacitance than other capacitor types.
Push Button
 Causes a temporary change in the state of
an electrical circuit only while the switch is physically
actuated. An automatic mechanism (i.e. a spring)
returns the switch to its default position immediately
afterwards, restoring the initial circuit condition.