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What is the difference between EMF, Voltage, Potential, Voltage Drop

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ElectronicsClub

Published on Jul 14, 2022

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What is the difference between such concepts: EMF - electromotive force, voltage, potential, voltage drop, potential difference. One of the most important parameters of any power source is the voltage value. For example, we are used to saying 15 V - one and a half volts, 9 volts, 12 volts, etc. However, if we measure the voltage at idle, that is, without a load, then as a rule the value will be slightly higher than the declared one, since we are actually measuring the electromotive force of the EMF of the power source, and it is always slightly higher than the declared value. When connecting a load - resistance, the voltage will decrease due to its partial decrease on the internal resistance of the power source. The higher the electric current of the load, the more noticeable this decrease. When adjusting electronic equipment, such a concept as potential at any point is often used. Its value is used to adjust or check the serviceability of the electronics. To determine the voltage at a specific point of the electrical circuit, the potential difference is measured: one current of the circuit is the point that interests us, and the second is the common one. The common point is often taken to be the minus of the power source or the case, but this is not always the case, so you should be careful. Often, voltage is understood as electromotive force and vice versa. In most cases, this is quite justified and does not entail significant losses in accuracy. #EMF #voltage # electronicsclub

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