Difficult Conversion........

Questions and answers on how to convert things from one unit or system to another
Forum rules
Dear convert-me.com forum visitors,

Our forum has been available for many years. In September 2014 we decided to switch it to read-only mode. Month after month we saw less posts with questions and answers from real people and more spam posts. We were spending more and more resources cleaning the spam until there were less them 1 legitimate message per 100 spam posts. Then we decided it's time to stop.

All the posts in the forum will be available and searchable. We understand there are a lot of useful information and we aren't going to remove anything. As for the new questions, you can always ask them on convert-me.com FaceBook page

Thank you for being with us and sorry for any inconveniences this could caused.

Difficult Conversion........

Postby Guest » Fri Feb 24, 2006 4:02 am

Not sure if it is possible. But... does anyone know how to convert Volts to w/m^2????
Guest
 

Postby Guest » Fri Feb 24, 2006 8:31 am

It is not. Under slightly special circumstances it is possible for a radio wave having a known electric field strength in V/m.

Generally, the power vector (also called Poynting vector) of a radio wave or and e-m wave is the vector cross product of the E field and H field. For a plane wave in free space, there is a fixed atio between these called the impedance of free space, usually represented by Z-sub-zero, which I can't represent here. It is about 377 ohms. (If there are any reflections or standing waves, this is not true)

For a propogating plane wave power density in W/m^2 is equal to the E-field ( in V/m) squared and divided by Zo.
S = E^2/Zo

This relationship is commonly used in calculating exposure to radio waves, which can injure by inducing heating if sufficiently high powered (that's what microwave ovens do, only we call it "cooking")
Guest
 


More info

  • List of all units you can convert online
  • Metric conversion
  • Convert pounds to gallons
  • Convert grams to cups
  • Grams to milliliters
  • Imperial vs US Customary
  • History of measurement
  • Return to How to convert?



    Our Privacy Policy       Cooking Measures Converter       Metric conversions

    cron