In this tutorial, we are going to learn about Best Tutorial on the Metric Numbering System.
The Electronic repair/design industry requires the use of the metric numbering system. Metrics are easy to use and make math processes simple. The metric system is based on factors of 10. For example, If we take 3, this is less than 10 and would remain as 3. Now 300 is a much larger number and could be shown as 3 times 102 or (10 times 10 would equal 100).
In electronics device the starting point is 1000 or 103 this is unit of kelo. This rating is common with device rating on resistors. The devices are common and typically have rating of thousand of millions of Ohms. So, with 3,000 Ohms = 3 X 103 Ohms, we could say that 3,000 to 3K that larger unit sizes have a smaller numbers from the base size of Ohms and smaller units sizes have larger number by three decimal points.
Example – Equivalent units must remain equal
2.2 K Ohms = 2200 Ohms 5,800 Ohms = 5.8 K Ohms
Here below is taking example –
A 3300 Ohm resistor is equal to a 3.3 K Ohms resistor.
A 30K Ohm resistor is equal to 30000 Ohm resistor.
Now for current rating the typical amount found on a printed circuit board can be below 1 Ampere. The unit size of milli = 10-3 is commonly found. An example could be 0.300 Amperes is equal to 300 m Amperes or 300mA. 1200mA = 1.2A.
Using powers of 10 we can make the math of Ohms law much easier. Voltage = current times resistance. Using the 3K Ohm resistor with 300 mA of current running through the part we could have voltage =(0.3 X 10-3) X (0.3 X 103) = 0.3 X 3 X 10-3+3 =0.9X1 = 0.9V = 900 mV.
Below are the metric units –
Unit s of 1000 = Kilo = K 3
Unit s of 100,000 = Mega = M 6
Unit s of 1000,000 =Giga = G 8
Unit s of 1/1000 = milli = m -3
Unit s of 1/1000, 000 = micro = u -6
Unit s of 1/1000, 000,000,000 = Pico =p -12
Conversion is a simple process – move the decimals are needed to maintain equal units. When multiplying and dividing change3 sign and cross multiple. You will gain practice with these processes when using Ohms law.