Quite often, in practice, it becomes necessary to convert milliamps to amperes. Experienced electricians have no problems with this. But novice specialists of such a profile may not immediately answer. Within the framework of this article, simple and affordable ways of performing this operation will be described.
Ampere is a unit that quantifies current strength. Its value can be determined by taking direct measurements with a multimeter, tester or ammeter (direct method). The strength of the current is measured only by sequential connection to the electrical circuit of the measuring device. In the second case, its value can be found out by making calculations (indirect method). If you know the voltage applied to a section of the circuit, as well as its resistance, then it is enough to divide the first into the second - and we will get the required value. In practice, amperes are not often used - this is a large value. Therefore, we have to use multiple units - micro (10-6) and milli (10-3). But to carry out electrical calculations, you need to convert them into basic units of measurement (for example, milliamperes to amperes). Consider the following example. The voltage on the section of the circuit is U = 6 V, and its resistance is R = 100 ohms. Let us determine the current strength I on it according to Ohm's law:
I = U / R, (1)
- U is the voltage at the section of the circuit, V;
- R is the resistance of the same section, Ohm;
- I is the current on it, A.
As a result of calculations, we get I = U / R = 6/100 = 0,06 A. Not a very convenient number for perception. Therefore, it is converted to multiple units of measurement. In this case, it is convenient to represent this value in milliamperes. For this, the obtained value of 0,06 A is multiplied by 1000 and we get 60 mA. You can also do the reverse conversion - milliamps to amperes. To do this, it is enough to divide 60 mA by 1000, and we get all the same 0,06 A. From this recalculation, you can see how many milliamperes are in ampere - 1000. Therefore, we divide or multiply by this number. If the prefix "micro" is used, then to switch from one unit of measurement to another, you need to multiply or divide by 1.
As noted earlier, ammeters, multimeters and testers are used to measure current strength. The highest measurement accuracy is provided by the first of them. They measure only one quantity and only one scale. And this is not very convenient. In turn, multimeters and testers allow you to measure almost all electrical quantities and not only in one range. Also, these devices have the ability to switch units of measurement. For example, the meter indicates that the range has been exceeded. In this case, you need to switch milliamps to amperes and, due to this, find out the required value. The main disadvantage of testers and multimeters is that, unlike ammeters, their error is much greater. But still, in practice, they are often used, since this makes it easy and simple to find a malfunction and fix it. Another important nuance associated with these devices: if earlier it was necessary to break the circuit, now there are testers and multimeters that allow you to measure the current strength in a non-contact way, that is, without connecting. This solution is increasingly being applied in practice.
Convert milliamps to amperes can be done in two ways. The first of them consists in carrying out arithmetic calculations using a special coefficient "1000" (the number of milliamperes in amperes). The second method is based on the use of special measuring instruments - a tester and a multimeter. They have special switches that allow you to easily convert milliamps to amperes and vice versa. Whichever method is more convenient is used in practice. If it is possible to find out the set value by calculation, then this method is used. Otherwise, a measurement is carried out, according to the results of which an unknown value is recognized.