What does Ohm's Law have to do with phone repair? Well, it has a lot to do with it. We will explain why.
Ohm's Law states that the Voltage is the result of multiplying the Resistance by the Current (V=RxI).
This means that in electronics, including phones, these three elements are always present.
For example, when we look for short circuits, we look for the resistance (or to explain a little, the resistance to the passage of electrons) to be low. So, we measure with our multimeter in ohm scale, that there are less ohms than normal or even 0 Ohms, and we measure in diode scale, that there are few volts, or 0 volts. You see? In a short circuit, the resistance goes down and consequently the voltage goes down.This is due to Ohm's Law. The lower the resistance, the lower the voltage.
Let's apply it to the equation: V=RxI. Suppose we have a voltage of 5 volts which is the result of the resistance being 2 Ohm and the current being 2.5 amps (5V=2 Ohm x 2.5A). This is an electronic circuit that is normal, without failures. Now, however, due to a malfunction, a short circuit occurs that lowers the resistance from 2 Ohm to 0.5 Ohm. Then, in that case, so that the multiplication between the three elements V, R and I is exact, consequently, the three values will change: since the resistance has dropped, the voltage drops and the current rises (the number of electrons rises).
Therefore, to find out the cause of a fault on a motherboard, it is important to make measurements with a multimeter.
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