TEST YOUR BRAIN!

1
TESTYOURBRAIN!
Components
2
Resistor
A resistor limits the amount of current flowing
in a circuit
Symbol
3
Preset Resistor Variable Resistor (Potentiometer)
The resistance between the centre pin and
the other two depends on the position of the
wiper.
Symbol
Symbol
4
Capacitor
A capacitor stores electrical charge
Electrolytic (polarised)
Polyester (non-polarised)
Symbol
Symbol
5
LDR Light Dependent Resistor
The resistance of an LDR decreases as it gets
lighter
Symbol
6
LED Light Emitting Diode
An LED produces light when connected the right
way round. The Anode must be positive The Cathode
must be negative
7
Diode
A diode only allows current to flow in
one direction. Anode to Cathode
8
Transistor
The current flowing through the transistor is
controlled by the current flowing into the base.
9
FET Field Effect Transistor
The current flowing through a FET is controlled
by the voltage on the gate.
10
Thyristor (SCR)
A thyristor is a latch, it only conducts
once triggered by a voltage on the gate.
11
555 Timer
A 555 timer is an Integrated Circuit (chip) used
to create delays and pulses.
12
PIC Peripheral Interface Controller
A PIC is a programmable chip that can perform a
range of functions set by the program.