![]() We resort to the formula given by the intensity value and we have that: We are going to invent a Ohm's Law practical exercise in which we will calculate the current that passes through a wire if we have a 220V source and a resistance of 1200 Ω. Remember that voltage is measured in Volts (V), current in Amperes (A) and resistance in Ohms (Ω). Like this with the rest of the variables.Īnother important aspect of the formulas are the measurement units. Do the test and cover the I, you will see that you get V/R. To remove the formulas of Ohm's Law with this mnemonic rule just cover with your finger the letter of the variable you want to calculate and the formula will automatically appear in the triangle. Now place the letters VIR as they appear in the picture and draw a line just above the letters IR. If you don't remember any of them, there is a trick that consists of drawing a triangle like the one above these lines. These are the three formulas of Ohm's Law. To understand a little more how Ohm's Law worksIn this section, we are going to see which are the different formulas that we can use depending on the variable we want to calculate: This potential difference mentioned in the definition of Ohm's Law is the main reason that causes the movement of electric charges through a conductor. The intensity of the electric current (I) flowing through an electrical conductor is directly proportional to the applied potential difference (V) and inversely proportional to its resistance (R). You may also find the following Physics calculators useful.The Ohm's Law is one of the pillars of the world of electricity and electronics and thanks to it we know that:
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