BASIC ELECTRONICSBasic electronics a by abdul rahaman
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Transcript of BASIC ELECTRONICSBasic electronics a by abdul rahaman
RESISTORS• Resistors are used to limit current or divide
voltage and in some cases, generate heat.• Used for driving circuit which requires low
current and voltage than available.• A two terminal non-polarised component.
• Unit of resistance is ohm.
• Notation for resistance
O- for ohm
K- for kilo ohm
M- for mega ohm
Contd…
CAPACITORS• A two terminal electronic component which
stores energy in form of charge.• capacitance is a measure of a capacitor's
ability to store charge.• A large capacitance means that more charge
can be stored.• Capacitance is measured in Farads(F) but
prefixes like µF and pF for smaller values.
Types of capacitors • Polarized
which have specified positive and negative terminals.
• Non-polarized
no defined polarity for terminals.
Practical use• Used for making timer circuits, when used
with resistance.• Used in clipper, clamper circuit.• Used for providing instantaneous large power
as in flashlight of cameras.• Used in DC filter circuits.
Types of diodes• LED i.e Light Emitting Diodes
These diodes emit light when provided with power supply.
Practical use• Used for making gates• Used for making rectifiers• Used as a switch• LED as indicators• Photodiodes as light detector
TRANSISTOR• A transistor is a semiconductor device
commonly used to amplify or switch electronic signals.
• Device with three terminals where one terminal can be use to control the flow of current through the other two terminals.
n-p-n as straight switch• When base of n-p-n is connected with logic
high voltage then it short circuit emitter and collector (SWITCH ON).
• When base of n-p-n is connected with logic low voltage then it open circuit both emitter and collector (SWITCH OFF).
p-n-p as inverted switch• When base of p-n-p is connected with logic
high voltage then it open circuit emitter and collector (SWITCH OFF).
• When base of p-n-p is connected with logic low voltage then it short circuit both emitter and collector (SWITCH ON).