User Tools

Site Tools


glossary:glossary_a

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision
Previous revision
glossary:glossary_a [2019/09/09 22:01]
tgerbic [Address] Add some useful context to Address.
glossary:glossary_a [2019/09/10 07:42] (current)
tgerbic [Amps] Changed to a more useful answer.
Line 59: Line 59:
  
  
-===== Amps =====+===== Amps or Ampere ​=====
  
  
-The unit of current. It is defined as the constant ​current ​which if maintained ​in two straight parallel conductors ​of infinite length, of negligible cross-section ​and placed one metre apart in vacuum, will produce between ​the conductors a force equal to 2×10-7newton per metre length.+An ampere is a measure ​of current ​flow. It is roughly ​defined as 6.28 X 10^18 electrons passing a point in one second. From a formula perspective one amp equals one volt divided by one ohm. If you had a one volt battery connected across a one ohm resistor, you would expect to measure one amp of current flow around ​the circuit. ​ Current values are often shown in formulas and on datasheets with the letters “A”, mA or uA.  In formulas ​current ​is generally shown as the letter “I”. For example E = I x R.  The letter “I” would most often be a value in amps, milliamps or microamps.  
 + 
 +In the model railroad context, you would expect to see a DC supply or a DCC booster providing several amps of current to a trackand most other circuits ​ or LED signals using ones to hundreds ​of milliamps.  
 + 
 +In a home environment,​ you would expect to see outlets in the 13 amp to 20 amp range and mains breaker panels working ​in the 50 amp to 200 amp range 
  
  
glossary/glossary_a.1568066505.txt.gz · Last modified: 2019/09/09 22:01 by tgerbic