Question

How do you calculate current using Ohm's law?

Answer 1

Ohm's law relates three fundamental electrical quantities: voltage (V), current (I), and resistance (R). It states that the current flowing through a conductor is directly proportional to the voltage across the conductor and inversely proportional to the resistance of the conductor. The mathematical formula for Ohm's law is:


=

×

V=I×R

Where:


V is the voltage across the conductor (measured in volts, V).

I is the current flowing through the conductor (measured in amperes, A).

R is the resistance of the conductor (measured in ohms, Ω).

To calculate the current (I) flowing through a conductor, you can rearrange Ohm's law formula as follows:


=


I=
R
V
    ​


Given the voltage (V) and resistance (R) values of the conductor, you can plug them into the formula above to find the current (I) in the circuit.

Keep in mind that Ohm's law is applicable to devices and materials that follow Ohm's law, known as "Ohmic" materials, like most conductors at constant temperature. For non-Ohmic materials, such as diodes and transistors, Ohm's law does not apply directly.