Power Measurent: Watts Vs. Volts

Power = Watts = Volts * Amps

If the unit measure of power is Watts, how come voltage is usually
expressed.
For instance, "Danger, Keep out: 50,000 volts!" (or just "High
Voltage"). Static electricity can zap you with 50,000 volts, and
you'll just feel a snap--Why?: Because there is very little amperage,
so the 50,000 volts may be with only .1^10 amps, giving
..000005 watts, whereas the "Danger, Keep out: 50,000 volts!" may be at
10 amps, providing 500,000 watts! So why don't they say "Danger, Keep
out: Up to (if the amperage varies) 500,000 watts!"?
Similarly, product "letter" batteries (A, AA, AAA, C, D) are all
measured as "1.5 volts" (I believe 2 equal 3 volts, 4 equal 6,
etc.--?). Don't the batteries have a defined amperage (maybe that's
the difference between A and AA and C, etc.?), thus why aren't they
defined as "___watt" batteries (if the amperage--and therefore the
wattage-- decreases as the battery weakens, its defined value would be
its full, maximum strength)?
Finally, radio signal strength: Why is it measured as "microvolts" and
not "microwatts", especially since a station's transmitter output power
*is* measured in wattage?

~Kaimbridge~

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