Question

What are resistance and its formula?

Answer 1

1. The opposition that a substance provides to the flow of electric current is known as resistance.
2. The uppercase letter$R$ is used to signify it.

The electrical resistance of a circuit can be determined in one of two formulas,

1. $R=\rho \frac{l}{A}$In the formula above, $\rho$ stands for rho, which denotes a material's resistivity. The length of the conductor you've been given is $L$, and the area of the cross-section of the wire or conductor you've been given is $A$.
2. Ohm's law is another formula that can be used to determine the electrical resistance of a system. One of the most well-known practical laws of circuit physics is Ohm's law. If the temperature remains constant, Ohm's law asserts that the current flowing through a circuit is exactly proportional to the voltage applied across it and inversely proportional to the resistance produced by the wire. The ohm's law formula is as follows: $V=IR$
3. The applied voltage is denoted by the letter $V,$ $I$represent the current situation, The electrical resistance is denoted by $R.$
4. If we know the voltage and current, we can use the formula above to calculate the electrical resistance.