"Alan Peake" wrote in message
...
wrote:
On Jun 6, 9:15 pm, Walter Maxwell wrote:
Since E/I is simply a ratio, R is also a ratio. And we know that a
ratio cannot dissipate power, or turn electrical energy into heat,
thus the output resistance R is non-dissipative. I have made many
measurements that prove this.
Hi Walt,
R is by definition a physical "property of conductors which depends
on dimensions, material, and temperature". So if we multiply both
sides of our "ratio" equation by I^2 to convert to power we get V*I =
I^2*R. Given that V, I, and R are all non-zero, why would you ask
us to believe that I^2*R and V*I could be zero? It's true that V^2/R
is a ratio. And I guess it's probably also true that the equation
itself doesn't dissipate power. But what would you have us believe
that that is supposed to prove?
73, Jim AC6XG
I always believed that a ratio was a comparative measure between like
units - e.g. forward voltage to reverse voltage, output power to input
power etc. Voltage to current is not a ratio. V/I has dimensions of
resistance - ratios are dimensionless.
Alan
Alan, I disagree with you when you say that 'voltage to current' is not a ratio.
IMHO, your are definine 'ratio' to narrowly. Below is a quote from Google:
Ratio
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This article is about the mathematical concept. For the Swedish institute, see
Ratio Institute. For the academic journal, see Ratio (journal).
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The ratio of width to height of typical computer displays
A ratio is a quantity that denotes the proportional[citation needed] amount or
magnitude of one quantity relative to another.
Ratios are unitless when they relate quantities of the same dimension. When the
two quantities being compared are of different types, the units are the first
quantity "per" unit of the second - for example, a speed or velocity can be
expressed in "miles per hour". If the second unit is a measure of time, we call
this type of ratio a rate.
Fractions and percentages are both specific applications of ratios. Fractions
relate the part (the numerator) to the whole (the denominator) while percentages
indicate parts per 100.
Note, Alan, the expression "When the two quantities being compared are
different types......
Walt, W2DU