<![CDATA[Math Is Fun Forum / I'm in trouble of 10 and exponent math.]]> 2021-01-03T17:36:48Z FluxBB https://www.mathisfunforum.com/viewtopic.php?id=25961 <![CDATA[Re: I'm in trouble of 10 and exponent math.]]> Got it.  I was using the wrong button on the calculator.  I was using the exponent button instead of power button.  Thanks!!!!!

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https://www.mathisfunforum.com/profile.php?id=223136 2021-01-03T17:36:48Z https://www.mathisfunforum.com/viewtopic.php?pid=416225#p416225
<![CDATA[Re: I'm in trouble of 10 and exponent math.]]> Hi don.farr,

Welcome to the forum. I believe you're missing out a factor of 10 in your multiplication -- note that:

This might help:

I'm getting 20 as the correct answer when I run through your calculation in A. Let us know if you need any more help!

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https://www.mathisfunforum.com/profile.php?id=206089 2021-01-03T17:06:40Z https://www.mathisfunforum.com/viewtopic.php?pid=416223#p416223
<![CDATA[Re: I'm in trouble of 10 and exponent math.]]> Good morning Bob and thanks for your help.  Yes I am using the exponent key on a calculator.
No matter how I do this, problem (A) is supposed to resolve to 20A.  I get 200A using the equation given in (A)

The textbook equation is give in (A) without any changes.  So I ask, what am I doing wrong in my evaluation of the formula?   Is it possible that the formula is incorrect or the answer given is incorrect?

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https://www.mathisfunforum.com/profile.php?id=223136 2021-01-03T15:39:52Z https://www.mathisfunforum.com/viewtopic.php?pid=416221#p416221
<![CDATA[Re: I'm in trouble of 10 and exponent math.]]> hi don.farr

I'm confused in trying to compare your two methods.

In B

(200*1.0e-6)

What does this mean?

1.0 x e^-6 is a different thing altogether.  e raised to the power -6 would not be a simple power of ten.

Are you using the 'exp' key on a calculator here.  That would make this 1.0 x 10^-6 which makes this the same as A.

Also

0.02       ((   2        ) / 0.00002)
0.0002 * 1OOOOO

Here you have changed 0.02 into 0.0002.  I cannot see why.

This physics is not my area but I can substitute values into a formula and evaluate.  Please go back a step and say where the values have come from.  Then I'll try to see what the correct evaluation is.

Bob

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https://www.mathisfunforum.com/profile.php?id=67694 2021-01-03T08:52:47Z https://www.mathisfunforum.com/viewtopic.php?pid=416211#p416211
<![CDATA[I'm in trouble of 10 and exponent math.]]> A)    VL =    Δi /Δt
(200*10-6) ((200*10-3)/2*10-6)
0.002       ((   2        ) / 0.00002)
0.002 * 1OOOOO
200V

B)    VL =    Δi /Δt
(200*1.0e-6) ((200*10-3)/2*10-6)
0.02       ((   2        ) / 0.00002)
0.0002 * 1OOOOO
20V

Where VL = Instant voltage on an inductor
Δi = Change in amperage
Δt – Change in time

The answer given in the textbook is “20 volts” However, using the book’s formula (A) I come up with 200V instead of the answer of 20V
So I created process “B” and I get the correct answer, but I cannot not explain why there is a difference between using the “Micro value (10-6) and using the exponent value 1.0e-6”

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https://www.mathisfunforum.com/profile.php?id=223136 2021-01-02T19:33:06Z https://www.mathisfunforum.com/viewtopic.php?pid=416205#p416205