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(ELE1C01)Electronic devices-College Library Copy
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ELE1C01- ELECTRONIC DEVICES 2020
Electronic devices:
Le-Ment College of Advanced Studies-Pattambi Passive and active electronic components:
Passive devices: or components do not generate energy, but can store it or
dissipate it. Passive devices are the main components used in electronics such as
University of Calicut resistors, inductors, capacitors and transformers which together are required to
B.Sc Electronics (CUCBCSS) - (2020 admission onwards) build any electrical or electronic circuit.
Passive components are electrical components that do not require any form of
electrical power to operate, unlike “active devices” such as transistors,
operational amplifiers and integrated circuits that require power for their
operation. Passive devices do not provide gain, amplification or directionality to
First semester a circuit and it cannot generate, oscillate or amplify an electrical signal.
(Complementary course) Passive components usually possess bi-directional behaviour. The most
common basic passive electrical elements namely, Resistance,
ELE1C01- ELECTRONIC DEVICES
Capacitance and Inductance.
Resistance
The resistor is a passive component that opposes the flow of electrical current
through it. The amount of opposition to the flow of current is called the
resistance of the resistor and is denoted by the symbol “R“. Resistance is a
measure of how easily or how difficult electrons can flow through a particular
Pradeep C P ( M.Sc,,M.Phil ) path in an electrical circuit and is expressed as a value in units
Assistant professor (Electronics) called Ohms. The resistance of a resistor can be defined in terms of the voltage
Le-Ment College Of Advanced
drop across the resistor and the current flowing through the resistor as related by
Studies. (Affiliated to Calicut
University) Pattambi Ohm’s law:
Palakkad
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ELE1C01- ELECTRONIC DEVICES 2020
These resistors are available in a wide range of values, from as low as 1 Ω to as
high as 22 Mega Ω.
Where: R is the resistance, V is the voltage across the resistor, and I is the
current flowing through the resistor. This relationship between the voltage and
current called the V-I relationship in a resistor is linear in both DC and AC
circuits.
Thermistor
The power absorbed by a resistor is represented by:
The word thermistor means a thermal resistor. Its resistance value changes with
the change in the temperature. These are normally made of semiconductor
materials. A resistance up to a few mega ohms can be obtained from
Different Types of Electrical Resistors thermistors.
• Carbon Composition Resistor
• Thermistor
• Wire Wound Resistor
• Metal Film Resistor
• Carbon Film Resistor
• Variable Resistor Wire Wound Resistor
• Varistor In wire wound resistor a wire of manganin or constantan is wound around a
• Light Dependent Resistor cylinder of insulating material. The range of resistance values varies from 1 Ω
Carbon composition resistor: to 1 MΩ.
Mainly made of carbon clay composition covered with a plastic case. The lead
of the resistor is made of tinned copper.
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