Maths

[m4tty]

Hi,

Can anyone help me out with some Maths im stuck on.

Ive got

R equals p x l

_____

A

17.2 x (10 to power of -6) x 60 x (10 to power of 3)

_________________________________________

1.5

Equals 6.88 x (10 to power of -1) ohms

or 0.688 ohms

Im having real trouble working out the above and getting correct answer on calculator. Do you have to have a calculator that does (to the power of) or can it be converted before doing the calculation.

Any help greatly appreciated.

Thanks in advance

Matt

 

[m4tty]

Is 17.2 to ther power of -6 mean

17.2 is 17.2x10 pwr 0

1.72 is 17.2x10 pwr -1

0.172 is 17.2x10 pwr -2

0.0172 is 17.2x10 pwr -3

0.00172 is 17.2x10 pwr -4

0.000172 is 17.2x10 pwr -5

0.0000172 is 17.2x10 pwr -6

Am i on the right track or well off

Thanks

 

[kme]

"10 to the power of" is the "EXP" key on a scientific calculator ( short for "exponent")

Other than your 10-0; which you shouldn`t use, you`re on the right track.

 

[kme]

"10 to the power of" is also exactly what is says:

i.e. 5.656 x 10 to the 4, for instance.

is literally 5.656 x 10, 4 times.

Would normally be used for very large or very small numbers, to remove the leading / trailing digits.

HTH

n.b. if you have a scientific calculator, and you do 999,999,999 x 999,999,999, the only way your calculator can display that answer is to provide it in "scientific notation"; which is this format of significant numbers, with an exponent to tell you how far to move the decimal point.

HTH

KME