Ohms Law was found by Georg Ohm and the equation is like this: V = RI. V is voltage, R is resistance and I is current. The law states that a voltage potential equals the current multiplied by the resistance. It is used very often as it is the fundamental formula in electronics. You can switch it around, and get R = V/I or I = V/R. As long as you have two of the variables, you can calculate via any of them.
Some beginners always forget the correct equation, so we will help you to remember Ohm’s law that by making an interesting association with it. Pretend that you are driving a car really fast, then suddenly you brake really hard. What sound do you hear? VRIII…It’s funny but useful, and this way you can remember V=RI.