Introductory Electronics Flashcards
what is work function?
what is thermionic emission?
min. energy that must be given to an electron in order to eject it from the metal.
temp. induced electron ejection
explain thermionic emission in tungsten filament.
pg 154
electron gun?
what is indirectly heated cathode?
what is the current and voltage required by the indirectly heated cathode?
cathode rays?
cathode rays pass through? function?
intensity of electron beam? how can it be controlled?
what happen after electrons pass through control gird?
how are electrons accelerated?
can the direction of cathode rays be changed? if yes how if no why?
yes
by electric and magnetic field
deflection by electric field?
deflection by magnetic field?
CRO?
how is visible spot on the screen observed?
uses of COR
measurement done by COR?
what is electronics?
what is analogue quantity? example?
digital systems? example comparing both?
why do we need dig. repre. as it seems inferior?
A to D conversion? vice versa
example? of graph
pg 160
what are logic gates?
an elementary building block of a digital circuit.
an electroni circuit which performs logical operations such as AND, OR & NOT
at any moment, every terminam is in one of the 2 binary conditions low or high
what is truth table?
the table which shows all inputs & outputs possibilities for a logic circuit. aka tables of comb. of inde. variables and depe. variables i.e input & output
what is logic equation?
gives a relationship between input & output variables
AND gate? logic equation? circuit symbol? switch representation? truth table?
has 2 inputs & will give high 1 output only if both inputs are high 1. In other words, if A=1 B=1 then X=1
X= A . B
