12.
A-C Generator.
13. When a filament is heated to incandescence, electrons will flow
from it to the plate.
This effect was first noted by British
scientist Sir J. J. Thomson and is still known today as the
a.
Edison effect.
c.
hot cathode.
b.
d.
electron theory.
14. If a signal equal to 1 volt was fed into an electron tube and
the output signal was equal to 20 volts, the signal was fed into a
________________________ tube.
a.
c.
squarer
b.
amplifier
d.
clipper
15. In 1901 the first wireless telegraph signal spanned the Atlantic
ocean. The inventor-experimenter credited with this radio signal is
a.
Thomas A. Edison.
c.
Guglielmo Marconi.
b.
Sir J. J. Thomson.
d.
J. A. Fleming.
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