To calculate the current flowing through a resistor in an electronic circuit, you need to know the voltage across the resistor and the resistance value itself. You can use Ohm's Law, which states that the current (I) flowing through a resistor is equal to the voltage (V) across the resistor divided by its resistance (R). The formula is:
I = V / R
where: I = Current (in Amperes, A) V = Voltage (in Volts, V) R = Resistance (in Ohms, Ω)
Simply rearrange the formula to solve for current (I) by multiplying the voltage (V) by the reciprocal of the resistance (R):
I = V / R
For example, if you have a resistor with a value of 100 ohms and a voltage of 5 volts across it, the current through the resistor would be:
I = 5 V / 100 Ω I = 0.05 A or 50 mA (milliamperes)
So, the current flowing through the resistor is 0.05 Amperes or 50 milliamperes in this example.