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Measurements in Electronics

 
Many students in their electronics studies have difficulties in understanding the units used in electronics.

Whatever units you are dealing  with amps(current), volts (voltage), watts(power) then the unit of measurement is broken down into smaller and larger units.

If you are refering to the electrical measurement of amps, 1 amp is a rather large unit used in power electronics, smaller units are required in electronics.

In electronics the prefix multipliers are in  increments or decrements of three orders of magnitude 

1 amp
1 milli amp = 0.001   shown in shorthand   10-3
1 micro amp = 0.000 001   shown in shorthand  10-6
1 nano amp = 0.000 000 001   shown in shorthand   10-9

The ohm (symbol: Ω) is the SI unit of electrical impedance 
The ohm (symbol: ?) is the SI unit of electrical resistance
An ohm is a small amount of electrical resistance, most resistors have a larger value given in increments of three orders of magnitude 

1 ohm
1 kilo ohm = 1000   shown in shorthand   103
1 meg ohm = 1000 000  shown in shorthand  106


 
 

 
The meter settings to allow the meter to read different ranges of current, voltage or resistance are shown opposite.

Notice how how the markings are  given in increments of three orders of magnitude 


 
 
 
 
 
 

 



 

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