
OHM’S LAW
Ohm’s law is the bread and butter of electronics, which lets us describe the
relationship between voltage, current, and resistance.:
V = I x R
• V = voltage (in volts)
• I = current (in amps)
• R = resistance (in ohms)
For instance, let’s say we want to calculate the value of a resistor we need to light
up a 0.02 amp LED with a 9 V power supply. We can rearrange Ohm’s law to form
R = (V/I) and evaluate the function as R = (9/0.02) = 450 . A 450 resistor ...