Question

How do you calculate the current flowing through a resistor in a circuit?

Answer 1

To calculate the current flowing through a resistor in a circuit, you'll need to use Ohm's Law. Ohm's Law relates three fundamental electrical quantities: voltage (V), current (I), and resistance (R). It is represented by the equation:


=

×

V=I×R

Where:


V is the voltage across the resistor (in volts, V).

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

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

If you know the voltage across the resistor and its resistance, you can calculate the current flowing through it. Rearrange the equation to solve for

I:


=


I=
R
V
    ​


To calculate the current, simply divide the voltage across the resistor by its resistance.

For example, let's say you have a resistor with a value of 100 ohms and the voltage across it is 5 volts. To find the current flowing through the resistor:


=
5
 V
100
 Ω
=
0.05
 A
I=
100 Ω
5 V
    ​

=0.05 A

So, the current flowing through the resistor is 0.05 amperes (50 milliamperes).