Question

Define resistancs. Disscus its types? ​

Answer 1

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Resistance is a measure of the opposition to current flow in an electrical circuit also known as ohmic resistance or electrical resistance. The ratio of the applied voltage to the current through the material is then known as resistance. There may be two types of resistors in general.

Answer 2

Answer:

Resistance :

• Resistance is a measure of the opposition to current flow in an electrical circuit. Resistance is measured in ohms, symbolized by the Greek letter omega (Ω).

Types :

(1) fixed resistor :

• The fixed resistor type is the most common resistor, when people talk about a resistor they most probably mean a fixed resistor.
• The picture to the right shows an axial carbon film resistor, the most common type. Fixed resistors have a constant resistance value.

(2)variable resistor :

• There are several variable resistor types, their general property is that the resistance value is adjustable.
• Most variable resistors are adjusted by mechanical movement (linear or rotary).
• When they are used as a variable voltage divider, they are called potentiometers. When they are used as a variable resistance to control the current in a circuit, they are called rheostat.

(3) thermistors:

• Thermistors are resistors of which the resistance changes significantly when temperature changes.
• Different thermistor types exist, the two most common types are the NTC and PTC thermistor.
• NTC thermistors decrease in resistance when the temperature rises, while PTC thermistors increase in resistance when the temperature rises.
• Thermistors are often used as temperature sensors or thermal protection devices.

(4)Varistors:

• varistors have a non-linear resistance which is dependent on the voltage over the varistor.
• Above a certain threshold voltage the resistance of a varistor drops very fast.
• Different varistor types exist, but nowadays the MOV varistor is the most used type.
• Their characteristics make them suitable as over-voltage protection devices and they are often used as surge protectors.

(5)Light dependent resistors:

• Light dependent resistors or photoresistors show a decrease in resistance when light intensity increases.
• They are often used to identify light or dark situations and are for example used to switch on street lights in the evening.

(6)The magneto-resistor:

• the magneto resistor type can be used to detect and measure magnetic fields.
• The resistance of a magneto-resistor changes with the magnetic field strength and direction

Explanation:

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