TEST
YOUR
BRAIN!
Resistor
A resistor limits
the amount
of current
Symbol
flowing in a circuit
Preset Resistor
Variable Resistor
(Potentiometer)
The resistance between
the centre pin and the
other two depends on the
position of the wiper.
Symbol
Symbol
Polyester (non-polarised)
Capacitor
Electrolytic (polarised)
A capacitor stores
electrical charge
Symbol
Symbol
LDR
Light
Dependent
Resistor
The resistance of an
LDR decreases as it
gets lighter
Symbol
LED
Light
Cathode
Emitting
Diode
An LED
Anode
produces light
when connected the
right way round.
The Anode must be positive
AnodeThe Cathode must be negative
Symbol
Cathode
Diode
Anode
A diode only allows
current to flow in one
direction.
Anode
Anode to Cathode
Cathode
Cathode
Transistor
Collector
The current flowing through
the transistor is Base
controlled
by the current flowing
into the base.
Emitter
FET
Drain
Field
Effect
Transistor
The
current
flowing
through
IRF530
a FET is controlled by
the voltage on the
Gate gate.
Source
Thyristor
(SCR)
A thyristor is a latch,
itAnode
only conducts once
Cathode
triggered by a voltage
on the gate.
Gate
TIC106
555
Timer
4
NE555
A 555 timer is an
1
8
Integrated
Circuit (chip)
2
7
used to
create delays
3
6
and pulses.
5
Peripheral
Interface 0V
Controller
Serialis
In
A PIC
1
PIC08M
PIC
8
+5V
7
Output 0
a2 programmable
6
Input 4 / Output 4 3
Input 1 / Output 1
chip that can perform
5
Input 3 4
Input 2 / Output 2
a range of functions
set by the program.