Question

please help me with this question

Answer 1

@lizzyrockefeller

Answer 2

which question

Answer 3

both :)

Answer 4

17 an 18

Answer 5

yup

Answer 6

okay

Answer 7

hmmm...

Answer 8

@paki

Answer 9

sorry im trying to read it an figure it out

Answer 10

its kinda blurry to me cuz i dont have my glasses on but im gettin it

Answer 11

yes i will

Answer 12

thank u a lot

Answer 13

hey ive tried every single way i can i cant get it sorry

Answer 14

"Using Kirchhoff's laws is a bit misleading: it can be quite tedious. Actually you also need to study the symmetries of the currents in the circuit.

Once you have done this, remember that any points at the same potential can be linked by a resistance-free wire. In that case, some branches will appear to be in parallel and can be treated as such.

Answer 15

hmmmm can u please explain

Answer 16

Imagine this situation:

Due to symmetry, potentials in C and D will be the same. So no current will go through the nR resistor at all.
It means you can either remove it, or, better, replace it by a conducting wire.

So overall resistance will be R/2 + R/2 = R

Apply this method to your cube-shaped lattice.

Answer 17

im finding it too difficult

Answer 18

@Vincent-Lyon.Fr please help me

Answer 19

@Nnesha might be helpful

Answer 20

Here is a link that demonstrates several methods to solve the first one.
http://www.rfcafe.com/miscellany/factoids/kirts-cogitations-256.htm
Note the advice of Vincent-Lyon.Fr was used in one method. But the application of Kirchoffs current law and assuming a value of 3 amps into the cube, then computing the respective voltage drops, then the use of plain ole Ohms Laws

Answer 21

This tutorial is great. I could not explain in a better way. :)

Answer 22

thanks @radar @Vincent-Lyon.Fr
i also need help with the second one

Answer 23

@Vincent-Lyon.Fr second one

Answer 24

@ganeshie8 might help

Answer 25

he did not come

Answer 26

@Abhisar might help

Answer 27

@iambatman might help

Answer 28

Although difficult to read, IMHO this is primarily a math problem, and we are concerned only with the DC resistance of two coils. When connected in series they present a total of 75 ohms resistance, when connected in parallel the result in the value of 75-57 or 18 ohms. We are to find the coils individual resistance. Please follow this: Let a be the resistance of one coil, and let b equal the resistance of the other the we have this: