Page 4 of 4 FirstFirst 1234
Results 46 to 56 of 56
  1. #46
    Join Date
    Aug 2004
    Location
    Coffs Harbour NSW
    Age
    86
    Posts
    272

    Smile Your's is harder

    Quote Originally Posted by jow104
    I'm glad I sold insurance it seems easier than being an electrical engineer
    You would have had the harder job,jow104, I don't know how you could sell insurance and keep a straight face.

    Peter R.

  2. #47
    Join Date
    Aug 2004
    Location
    Coffs Harbour NSW
    Age
    86
    Posts
    272

    Smile Thank you kind Sir

    Quote Originally Posted by
    Thanks , now I see why you get the big money.
    Guess what (not watt) I did a calculation and when I dropped the voltage from 240 to 140 the amps came down with the same resistance.
    Drop the voltage and the amps drop too, not increase.
    Now Bob, umpire, mate, I want you to go back to whomever it was that said I was wrong and Just explain to him....If you don't mind.

    If you feed hampsters on good pancakes they will run like a horse...true.

    Peter R.

  3. #48
    Join Date
    Feb 2003
    Location
    Garvoc VIC AUSTRALIA
    Posts
    3,208

    Default

    The theory involved with electric motors is far more complex than mere Ohms Law.
    The performance of electric motors are influenced by
    Mechanical loads
    Voltage
    Current
    Resistance
    Inductive Reactance
    Capacitive Reactance
    Magnetic properties of the iron (etc) in the motor
    Hysteresis
    Phase shifts as a result of the motor design.
    Frequency, and possibly other things I can't recall at the monent

    Significant errors can occur if you apply simple ohms law to a motor.
    Dynamic testing is the only accurate way to assess the relationships of voltage and current, (unless you are a design electrical engineer)
    Regards, Bob Thomas

    www.wombatsawmill.com

  4. #49
    Join Date
    Feb 2003
    Location
    Garvoc VIC AUSTRALIA
    Posts
    3,208

    Default

    Generally if you halve the voltage applied to the motor the performance deteriorates but the speed doesnt reduce very much. (The same applies if you double the motor voltage, the current doesn't increase very much)
    Regards, Bob Thomas

    www.wombatsawmill.com

  5. #50
    Join Date
    Sep 2002
    Location
    Paignton. Devon. U.K.
    Posts
    1,611

    Default insurance

    PeterR.

    I found the easiest way to sell insurance was to let the client buy, that saved me a great deal of effort.

    (Ex. Pearl Assurance man now AMP)
    woody U.K.

    "Common looking people are the best in the world: that is the reason the Lord makes so many of them." ~ Abraham Lincoln

  6. #51
    Join Date
    Sep 2002
    Location
    Minbun, FNQ, Australia
    Age
    66
    Posts
    1

    Default

    Quote Originally Posted by Peter R
    ...I did a calculation and when I dropped the voltage from 240 to 140 the amps came down with the same resistance.
    Drop the voltage and the amps drop too, not increase.
    Now Bob, umpire, mate, I want you to go back to whomever it was that said I was wrong and Just explain to him....If you don't mind....

    If you feed hampsters on good pancakes they will run like a horse...true...
    Pete, you are on a hid'n ta nuth'n, stop now.

    The calculation you did was on paper & it assumes DC current & a purely resistive load.

    A router motor is NOT running on DC & it's NOT a purely resistive load.

    Somethings are NOT what they seem on paper, even if you ARE using a calculator.

    There's a differance between electrical & electronical.

    Electrical is simple, electronical is complex.
    Once you move away from straight DC & purely resistive loads, it becomes electronical.
    You can still use simple laws for calculating loads with houshold AC power if you don't start F'n around with the voltage 'cos the stuff was designed to behave fairly normaly at those set voltages. Once you start dicking with the voltage, you are outside the normal design parameters & they don't, READ DO NOT, behave according to simple laws that you can work out in your head or even on your calculator.

    Now, let's get back to the more IMPORTANT things in life.... 42?

    Test ya pancake mix on THIS!!!!
    (don't ask me how I found it 'cos you won't believe me.)
    Cliff.
    If you find a post of mine that is missing a pic that you'd like to see, let me know & I'll see if I can find a copy.

  7. #52
    Join Date
    Sep 2002
    Location
    Paignton. Devon. U.K.
    Posts
    1,611

    Default I 've Had A Thought

    WHAT DATE DO YOUR CHILDREN BREAK UP FROM SCHOOL???????

    Kids have been known to use other peoples computers!!!!!!!!!!!!!!!!!
    woody U.K.

    "Common looking people are the best in the world: that is the reason the Lord makes so many of them." ~ Abraham Lincoln

  8. #53
    Join Date
    Mar 2002
    Location
    Brushgrove, NSW, Australia
    Age
    77
    Posts
    0

    Default

    Re those nasty pop-ups - if you have windows XP get service pack 2 (the CD is free from Microsoft) - it stops them all.

    Caution!! - it can also stop your bank, etc, popups so you may have to enter your bank's, etc, web address(es) in the exceptions box.

  9. #54
    Join Date
    Aug 2004
    Location
    Coffs Harbour NSW
    Age
    86
    Posts
    272

    Talking One brave and helpful man

    Quote Originally Posted by graemet
    Getting back on track, Peter. Win98 computers have this function in the setup, ie when you turn the computer on, amongst all the crap that scrolls up the screen is "hit DEL to enter setup" (or something like that, it's a while since I had Win98). Go to "Power Management Setup", scroll down to "PWRON after PWR fail" and toggle it to "off". Then your computer won't turn itself on when the power comes on again. I used the feature the other way, ie. to turn the computer on when I switched the power point on at the wall that had everything connected to it, printer, modem, speakers etc.
    Cheers,
    Graeme.
    Out of the steaming mist from decaying gobbldeygook comes the one man that has kept head clear of all distractions, and pancake recipes, to give help in the original reason for the post.
    Thank you Graeme, it was a little different than you explained but your help put me in the right direction. I have switched off the power after failure sequence, so that should solve that problem at least.

    Happy Chrissy.

    Peter R

  10. #55
    Join Date
    Feb 2003
    Location
    Garvoc VIC AUSTRALIA
    Posts
    3,208

    Default

    "the steaming mist from decaying gobbldeygook"

    Now that is a brilliant phrase PeterR, seems a pity to waste it in one big paragraph so I might see if there are other places to use it.

    Actually getting a straight answer after only 4 pages is pretty good going!
    Regards, Bob Thomas

    www.wombatsawmill.com

  11. #56
    Join Date
    Aug 2004
    Location
    Coffs Harbour NSW
    Age
    86
    Posts
    272

    Angry Ya Can't have it

    Quote Originally Posted by echnidna
    "the steaming mist from decaying gobbldeygook"

    Now that is a brilliant phrase PeterR, seems a pity to waste it in one big paragraph so I might see if there are other places to use it.

    Actually getting a straight answer after only 4 pages is pretty good going!
    Give it back,Bob, or I'll tell. Too bloody late, you've already used it in another post - you are a plaga....plagr.....plugg.....a word robber.

    Peter R. (not really)

Tags for this Thread

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •