Resistance is the measure of opposition to the flow of electric current. It is measured in ohms (Ω) and is represented by the symbol "R".
Resistance and current are inversely related. This means that as resistance increases, current decreases, and vice versa. This relationship is described by Ohm's Law, which states that resistance is equal to the voltage divided by the current (R=V/I).
The unit for current is ampere (A), also known as amp. It is the measure of the rate of flow of electric charge through a circuit, and is represented by the symbol "I".
To calculate the resistance needed for a specific current, you can use Ohm's Law (R=V/I). You will need to know the voltage and the desired current. Plug in these values to the equation and the result will be the resistance needed.
Knowing the resistance needed for a specific current is important because it allows us to design and build circuits that can safely and efficiently handle the desired amount of current. It also helps us understand the behavior of electricity and how it flows through a circuit.