Question

What are resistance and its types?

Answer 1

1. The opposition that a substance provides to the flow of electric current is known as resistance. The uppercase letter $R$ is used to signify it.
2. The $Ohm\left(\Omega \right)$ is the SI unit of resistance.
3. When a $1-volt$ potential difference is applied to an object which flows through $1Ampere$ of current, it is the resistance it offers.
4. Resistance is measured in ohms, which is represented by the Greek letter omega $\left(\Omega \right)$.
5. Resistance is defined as the ratio of the applied voltage and the current flowing through the material.
6. The following are the two basic types of resistors: (1) Linear resistor (2) Non-linear resistor
7. A linear resistor is a two-terminal circuit element that obeys Ohm's law, meaning that the voltage across it is proportional to the current flowing through it. The Ohmic resistor is another name for a linear resistor.
8. Non-linear resistors are ones in which the electric current flowing through them fluctuates with changes in applied voltage or temperature, rather than following Ohm's law.
9. Linear resistor are further devided into two parts: Fixed and Variable.
10. Fixed resistor: The value of resistance cannot be changed.
11. Variable resistance: The value of resistance can be changed. Example: Rheostat.