Chapter 5: Series Circuts confusion

Discussion in 'General Electronics Chat' started by circ, May 7, 2011.

  1. circ

    Thread Starter New Member

    Feb 18, 2010
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    Hi Guys,

    So I am going through the electronics book, am on Vol 1 DC Chapter 5. I was reading the current calculations for a series circut and am a little confused as to how the author reached 500 MicroAmps when from what I know it should be 500milliAmps. Link to page.

    So 9v/18k ohms = 0.5 AMPS. Moving the decimal 3 to the right gives us 500mA not 500microAmps as we moved the decimal -3 places (milli) and not -6 (micro).

    Thats from the little I know. Can someone please clarify ..

    EDIT: Ahh! Got it, 18k = 18000 ohms! I forgot about the zeros. Still getting used to the metric notation!
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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    Got a calculator? Mine shows that 9/18,000 = .0005, or 500 microamps.
     
  3. tadagatsu

    New Member

    May 7, 2011
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    u got simple mathematical mistake its 9/18k=0.5m=500u
     
  4. circ

    Thread Starter New Member

    Feb 18, 2010
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    Thanks guys. I figured I was missing the zeros as soon as I submitted my post.
    BTW, is there any shorthand for 'micro' other than the upside down h ?
     
  5. Wendy

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    Mar 24, 2008
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  6. circ

    Thread Starter New Member

    Feb 18, 2010
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    Cool, thanks bill. Alt+234 gives me Û

    Another Q, is voltage drop the amount of voltage used/lost on a given load ?
     
  7. Wendy

    Moderator

    Mar 24, 2008
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    Basic Ohm's Law, useful forever.

    V=I/R
    I=V/R
    R=VI

    Did you see the omega symbol on my posts?
     
  8. circ

    Thread Starter New Member

    Feb 18, 2010
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    I did see the omega symbol.

    Im not with you with regards to the Ohms bit though.

    Also, whilst I am gaining all of this theoritical knowledge I want to apply it so that I gain some practical experience and it sticks. Do you have any 'coursework' I can do per chapter (not more theory stuff but practical) ? And can you recommend any 'starter' kits that have all that I need ?
     
  9. bertus

    Administrator

    Apr 5, 2008
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  10. circ

    Thread Starter New Member

    Feb 18, 2010
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    Thanks Bertus.
    There are quite alot of tools I will need ! Are there any starter kits which contain most if not all of the tools I need ?
     
  11. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    Where are you located?
    If we know that we can give you a better advice on where to buy your parts needed.

    You can also take a look at this thread: Starter Kit

    Bertus
     
    Last edited: May 7, 2011
  12. circ

    Thread Starter New Member

    Feb 18, 2010
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  13. bertus

    Administrator

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  14. BillB3857

    Senior Member

    Feb 28, 2009
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    Sometimes my fingers have a mind of their own, too.
     
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