Question

* Identification and study of various bons of
resistors study of measuring instruments

Answer 1

Answer:

Resistance:

The property of a substance which opposes the flow of electric current (or electricity) through it is called Resistance OR Resistance is the ability of a circuit which opposes current.

Mica, Glass, Rubber, Wood etc. are the examples of resistive materials. The unit of resistance is OHM (Ω) where 1Ω = 1V/1A. which is derived from the basic electrical Ohm’s law = V = IR.

Other definitions of Ohm “Ω” are as follows;

If there is a potential difference of 1 volt between two ends of the conductor and the flowing current through it is 1Ampere, then the resistance of that conductor would be 1 Ohm (Ω). OR

If 1 ampere of current is flowing through a resistance, and 1 joule per second (1Watt) energy (in the form of heat) is generated, then the measurement of that resistance is 1 Ω.

Ohm is the measurement quantity of resistance, which produces one joule of energy (in the form of heat) in one second, when one ampere of current is flowing through it.

The reciprocal of the resistance is called conductance.

Resistor

A resistor is a component or device designed to have a known value of resistance. OR,

Those components and devices which are specially designed to have a certain amount of resistance and used to oppose or limit the electric current flowing through it are called resistors.

Good to know: Resistance of a resistor depends on their length (l), resistivity (ρ) and its cross sectional area (a) which is also known as laws of resistance … R = ρ (l/a).

IEEE & IEC symbols of Resistors

Types of Resistors. IEEE & IEC symbols of Resistors

IEEE & IEC Symbols of Different Types of Resistors.

Types of Resistors:

Resistors are available in different size, Shapes and materials. We will discuss all possible resistor types one by one in detail with pro and cons and application as follow.

Resistors Types chart and Tree

Different Types of Resistor Chart/Tree.

There are two basic types of resistors.

Linear Resistors

Non Linear Resistors

Linear Resistors:

Those resistors, which values change with the applied voltage and temperature, are called linear resistors. In other words, a resistor, which current value is directly proportional to the applied voltage is known as linear resistors.

Generally, there are two types of resistors which have linear properties.

Fixed Resistors

Variable Resistors

Fixed Resistors

As the name tells everything, fixed resistor is a resistor which has a specific value and we can’t change the value of fixed resistors.

Types of Fixed resistors.

Carbon Composition Resistors

Wire Wound Resistors

Thin Film Resistors

Thick Film Resistors

Carbon Composition Resistors

A typical fixed resistor is made from the mixture of granulated or powdered carbon or graphite, insulation filler, or a resin binder. The ratio of the insulation material determines the actual resistance of the resistor. The insulating powder (binder) made in the shape of rods and there are two metal caps on the both ends of the rod.

There are two conductor wires on the both ends of the resistor for easy connectivity in the circuit via soldering. A plastic coat covers the rods with different color codes (printed) which denote the resistance value. They are available in 1 ohm to 25 mega ohms and in power rating from ¼ watt to up to 5 Watts.

Carbon Composition Resistors.Construction and Wattage Rating

Answer 2

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