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| glossary:glossary_a [2019/09/09 22:01] – [Address] Add some useful context to Address. tgerbic | glossary:glossary_a [2019/09/10 07:42] – [Amps] Changed to a more useful answer. tgerbic |
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| ===== Amps ===== | ===== Amps or Ampere ===== |
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| 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. |
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| | In the model railroad context, you would expect to see a DC supply or a DCC booster providing several amps of current to a track, and most other circuits or LED signals using ones to hundreds of milliamps. |
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| | 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. |
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