Only allow current to
pass through them
when thet are forward
biased.
LEDs
Is a diode with the same
characteristics of them and
that lights up when current
pass through it and its
maximum voltage is 2v.
Resistor
Variable Resistors
LDRs
Resistant value that varies
according to the amount of
light that hits them
NTCs
Resistant value that
varies inversely with the
temperature
PTCs
Resistant value that varies
directly with temperature.
Potentiometer
Resistor with a value set by the user
from a range of operating values
Capacitor
Store electrical energy. The amount
of energy that can store depends on
the capacitor.
Transistor
It has three parts to connect: The base, the emitter and the collector.
Depending on the amount of electrical current that reaches the
transistor through its base,it can function like a switch or a current
amplifier.
Control and Protection Devices
One-way switch
Open and close the circuit
when they are actuated
Push Switch
Open and close the circuit,but
only while we keep them
pressed
Two-way switch
Open and close the circuit. They
can also open some circuits and
close others simultaneously
Relay
Electromagnetic components.They are activated
when an electrical current flow throgh them.
They are used to control the opening and the
closing of circuits when they are activated by a
secondary circuit.
Fuse
Protect the components of electric
circuits from power surges