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/sci/ - Science & Math

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4343970 No.4343970 [Reply] [Original]

This is the second homework thread I've made in two days on this board, but I promise this will be my last. (I bloody regret picking this module now...)

What is Vout when both switches (A and B) are closed?

Many thanks

>> No.4343978

+5 mV

>> No.4343980

>>4343970
>>4343978
Reported.

>> No.4343985
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4343985

>>4343980
FUCK OFF AND CASTRATE YOURSELF, RETARD ASPIE

>> No.4343986

>>4343978
Care to share some light on how you reached that answer? But thanks...
>>4343980
Not samefagging, if that's what you're thinking.

>> No.4343991
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4343991

>>4343986

>> No.4343999

depends on type of diode, if silicon then around 0.7V.

>> No.4344002

>>4343980

>he thinks +5mV is the answer.

Diodes have a 0.7V threshold voltage that must be overcome.

There is a voltage drop across the resistor.

Think about it.

>> No.4344004

>>4343999
nuhhh
>>4343991
the only type we've learnt about is silicone, so i figure it's those. i was thinking 0.7 too, but that almost seems to simple. is there any maths/equations to it, other than just knowing diodes have a voltage drop of 0.7v?
thanks

>> No.4344012

>>4343991
Why don't you post science?

>> No.4344118

ugh, bump

>> No.4344201
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4344201

>> No.4344212

>>4344201
i..uh, what? i dont see how that's relevant (do excuse my ignorance)

>> No.4344238

use a circuit simulator (preferrably orcad)
post results

>> No.4344249

Diodes has a voltage drop of 0.7V
So the voltage after the resistor is 5-0.7=4.3V

>> No.4344255

>>4344249
oh wait, forgot the resistor was 1K ohm

that would yield a too small voltage at vout for the diodes to be in ON mode, no current is flowing, thus no voltage drop over the resistor, Vout= 5V

>> No.4344282
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4344282

>>4344238
i dont have orcad, this is the best i could do (but the vout seems very wrong..idk)
>>4344255
that makes sense.. kinda, thanks!

>> No.4344407

>>4344249

voltage *across* resistor is about 4.3V, and Vout=5V-4.3V=0.7V

>> No.4344429

>>4344407
i'm unsure of where you're getting the voltage across the resistor from?

>> No.4344452

VR+VD=5V
VD=0.7V
VR=4.3V
Vout is measured relative to the 0V rail.

>> No.4344475

>>4344452
Right, that makes sense. Thank you!

>> No.4344543

Okay whilst I'm here..

What would Vout be if both the switches were open? The full 5v?

>> No.4345906

Yes, 5V. Because no current through R, no voltage drop.