Question

How is resistance calculated?

Answer 1

Resistance (R) is a fundamental concept in electrical engineering and physics that measures the opposition to the flow of electric current through a material or component. It is measured in ohms (Ω). Resistance can be calculated using Ohm's law and the formula:


=


R=
I
V
    ​


Where:


R is the resistance in ohms (Ω).

V is the voltage across the component in volts (V).

I is the current flowing through the component in amperes (A).

In other words, resistance is the ratio of voltage to current. It signifies how much voltage is required to maintain a certain current through a given material or component.

For example, if you have a component across which a voltage of 10 volts is applied, and it allows a current of 2 amperes to flow through it, then the resistance of that component would be:


=


=
10
 
V
2
 
A
=
5
 
Ω
R=
I
V
    ​

=
2A
10V
    ​

=5Ω

This means that the component has a resistance of 5 ohms, and it will require 10 volts to maintain a current of 2 amperes through it.

It's important to note that resistance can vary with temperature, material properties, and other factors. In some cases, the relationship between voltage and current might not be linear, and the resistance could be a more complex function of these variables.