Does anyone here know shit about electricity?

[Erik]

You know, how to calculate resistance and currents in various circuits and shit? I need your help, I'm doing an entrance exam to the audio engineering program in Piteå tomorrow and they have questions of this nature.

Like, for example, this circuit:



For calculating the resistance in this circuit, am I right in thinking that the first part would be:

(1/R1) = 1/100 + 1/100 + 1/100

Second part:

(1/R2) = 1/100 + 1/100

Third part:

(1/R3) = 1/100

And the resistance of the whole circuit like so:

1/R = (1/R1) + (1/R2) + (1/R3)

PLZ HELP I DON'T UNDERSTAND THIS SHIT

 

[Mormagil]

That looks right to me, but if you have to find out the voltage or current, I have no idea.

EDIT - WHOOPS, you got the last part wrong. The resistance as a whole is just the sum of the first three resistances.

 

[Mormagil]

ninja edit wasn't fast enough

I hope you didn't turn in your exam already

 

[Mormagil]

actually it should be about 183 ohms.

You can break the resistors into a series combination like this:

where (1/RA) = 1/R1 + 1/R2 + 1/R3
(1/RB) = (1/R4) + (1/R5)
RC = R6

remember to take the reciprocal of the first two as they're 1/RA and 1/RB, not RA and RB.

resistors add in series so R = RA + RB + RC

 

[unhinged]

I know that if you touch a spark plug on a cement mixer with bare hands on a wet day you can blow yourself across a street

ow

 

[Hell Mike]

I know that if you touch a spark plug on a cement mixer with bare hands on a wet day you can blow yourself across a street

ow

Erik, note this for bonus points on the test

 

[Mormagil]

It just so happens that my physics notes on impedance from last semester are sitting right next to me, so here goes.

X = 1/(2*Pi*FC)
Z (impedance) = (R^2 + X^2)^1/2

 

[E-bortion]

holy ehist im too drink for this