What is meant by virtual ground in the op amp ?
Answers were Sorted based on User's Feedback
Answer / safi sara
since there are two input terminals in the inputside so the
resistance between the two input terminal is very very
high.so a negligible amount of current flows through op-amp
otherwise the current will be zero,then current only passes
through feedback resistance.hence the input terminal is
assumed to be virtual ground
| Is This Answer Correct ? | 9 Yes | 11 No |
Answer / vivek
opamp gain is is very high about greater than 1000
so according to formula gain A=Vo/Vi, Vo=A*Vi, Vo=1000*Vi,
so if we apply small voltage of .025V, we get o/p volatage
Vo=1000*.025=25V, so due to high gain we need very small
or negligible amount of i/p voltage or current. so we
ground the one port at i/p side it means no current flows
through it but practically it always has some value in the
fraction of ampere.
| Is This Answer Correct ? | 18 Yes | 26 No |
Answer / kohila
the input resistance of the amplifier is very high so the current does'nt flow through the path.so the current will flow through the feedback path
| Is This Answer Correct ? | 3 Yes | 16 No |
Answer / mehran ahsan
the resistance b/w the two terminals of input
| Is This Answer Correct ? | 5 Yes | 26 No |
pls send rrb question paper of je of last 5 years at my email id i.e. singh.anni88@yahoo .co.in
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