Fixing Conversion Errors

Experience with an on-line conversion system showed that users would ask for impossible conversions, e.g. convert amps to horsepower.

However, it is possible to lead the user to a correct specification:

• Divide the goal unit by the source unit symbolically

• Simplify the resulting unit expression

• Present the result to the user:

  The units could be converted if you multiplied by an appropriate quantity of VOLT