# Questions tagged [electric-circuits]

An electronic system, with closed loop current flow, and relative electrical potentials present across electrical components.

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### Kirchoffs current law [closed]

If current passing through a wire which is connected to two different cross section and length wire then how the two different current correlated with respect to cross section amd length.
62 views

### Why voltage across the parallel capacitor or resistor remain same? [closed]

I can't intuitive understand why voltage across then remain same. I know that if that doesn't happen it will violate Kirchoff's law and it will violate energy conversation. can someone explain it to ...
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### How to find a loop in an electric circuit? [closed]

In the book I read, the definition of a loop in an electric circuit is as follows: A closed path starting at a node and proceeding through circuit elements, eventually returning to the starting node. ...
1 vote
36 views

### Is the current reference direction just a reference?

I am now learning about electrical circuits from scratch. Regarding the current reference direction, may I ask if it is just a reference right and the actual direction should be based on whether the ...
1 vote
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### What is the electric field around a non-current carrying wire?

So that seems like a silly question but I can't quite rationalize something about it. Electric field in between the plates of a capacitor is defined as E= emf/d. A dipole antenna acts as a very ...
16 views

### Exercise on electronic circuit [closed]

I am trying to solve the following circuit: I wrote the equations for knot $B$ and the circuits $ABEF$ and $BCDE$: $i_1=i_2+i_3$ $V_1-R_1i_1-R_3i_3=0$ $-V_2-R_4i_2+R_3i_3-R_2i_2=0$ What is wrong?
463 views

### Electric power transfer

I'm reading electric power from the book "Fundamentals of physics textbook by Robert Resnick" and I have a question about the interpretation of the text. First it says "The principle of ...
30 views

### How does adding a wire across a cell and a resistor change the p.d. across a different resistor in a multi-cell circuit?

I'm a A-level physics student. I'm trying to work out why closing the switch in the circuit below makes a difference to the voltage across one of the resistors. When the switch is open, using the ...
25 views

### Circuit fitting - EIS [closed]

I'm fairly new to electrochemical impedance spectroscopy (EIS). On some slides I was given, I have been provided with two circuits which would produce the same nyquist plot. I was wondering what real-...
66 views

### Earthing and Earth's voltage

I'm looking into earthing within my topic of electric fields and i'm really getting confused with the aspect of earth having zero potential difference. My understanding of potential difference is that ...
1 vote
19 views

### How to calculate the minimum current going through a wire that causes another wire to slide towards itself? [closed]

I’ve run into this question in my physics class that I am struggling with. “Wire 1, with mass 0.010 kg and length 1.0 m, has a square cross section and is initially at rest on a table. It is ...
22 views

### Does Digital multimeter need any AL program? [migrated]

Unlike analog type, Digital Multimeters (DMMs) convert the external qunatities into Digital output and displays on small LCD. Does this work only on circuits or it uses any microcontroller (which use ...
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1 vote
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### What is electromotive force? What's its relationship to Voltage? + clarification of confusion

So first of all, yeah I know that the electromotive force is not a force (the name was coined by Alessandro Volta I think). About Power and dissipated power The power with wich a battery provides the ...
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