# Questions tagged [electrical-resistance]

The tag applies to electrical resistance and resistors. DO NOT USE THIS TAG for non-electrical resistance.

1,557 questions
Filter by
Sorted by
Tagged with
22 views

### Simplifying electrical circuits [migrated]

I have looked everywhere, but i can't seem to find a way to simplify this circuit. I wish i could tell you some of my ideas, but i'm really lost here, can someone help me? If you could explain how to ...
373 views

### Does direction of current in Node Voltage method circuit analysis matter?

I am trying to solve the following circuit using the node voltage method, but I'm having issues with figuring out how current is supposed to flow in and out of nodes. I understand that the current ...
11k views

### How to find the total current supplied to the circuit?

Recently, I came across a question based on finding electric current of a circuit. Here's the image... I know, by using the formula $I=V/R$, we can easily calculate the current as $V$ is given and $R$...
249 views

### Why is the residual-resistance ratio (RRR) a measure of good crystalline quality?

I am currently revising a paper on a few parameters of metallic Al, and it indicates that a higher RRR is a measure of good crystalline quality. My question is why would this be the case, if having a ...
44 views
+50

### Why to use non-inductive resistances in Callendar-Griffiths bridge?

Worsnop in his Advanced Practical Physics for Students states that All the resistances should be 'non-inductive', for in this method it will be seen that the galvanometer is permanently connected ...
611 views

### Current from Middle Battery in a Two-looped Circuit

With this question, as with many tutorials of similar questions I’ve found online, my textbook only mentions three currents: $I_1$, which flows through the left loop from and to the 19 V battery, $I_2$...
24 views

### What methods do I need to solve this? [on hold]

What methods should I do to solve (b)and(c) I can find answer (a) but I don’t know how to do with (b)&(c) I’m very appreciate if you can help me (This not my homework but I need to do for ...
24 views

### Power voltage relation

I have a question concerning the relation between power and voltage. We have a lamp with power of 36W when used with 12V. With what power does the lamp work if we connect it to a 6V battery? First,...
148 views

### Internal resistance and a resistor as a potential divider

Based on the fact that batteries have some kind of internal resistance, if I had a circuit that consisted of a battery and a resistor of some kind would they act like a potential (voltage) divider? ...
23 views

### How do I connect this 2V Diode to my circuit to fullfill the given requirements? [on hold]

So I am struggling a bit with an excercise. "Your task is to make a red diode light up by connecting it to a voltage source of 12V. The current through the diode should be 10mA, and then voltage ...
18 views

### How to go about solving this question? [closed]

This question is from first order circuit and under the heading of source free RL circuit (https://i.stack.imgur.com/SY1L6.jpg)
455 views

### Energy dissipation in current flow

In section 4.8, Energy dissipation in current flow, of Purcell and Morin's Electricity in Magnetism, the expression for the power expended by a resistor is derived. The sections includes the following ...
112 views

### Nordheim Theory for resistivity of alloy

Is there any information on the actual number of Nordheim theory? A paper I found says, the resistivity of a binary alloy follows, $$\rho=x(1-x)(V_a-V_b)^2$$ ,where $V_a$ and $V_b$ are "potential", ...
316 views

### Parallel combination of resistance [duplicate]

Why does the Equivalent resistance decrease when we connect resistors in parallel? I know current divides and potential difference is constant but my question is that if Equivalent resistance have ...
15 views

### Noise Fundamentals - Johnson Noise

How can be Johnson Noise measured with the help of single electronic instrument (experimentally)?
35 views

### Can somebody help out with this ridiculous circuit? [duplicate]

All the resistors are in ohms. I need to work out the current and power.
238 views

### How can I redraw this circuit where I can apply Kirchoff's Voltage and Current Law to get correct Voltage at V?

I thought I can draw the -5 V as a source but it did not turn out to be right, unfortunately.
4k views

### Why should a voltmeter have a higher resistance than of any circuit element across which the voltmeter is connected?

According to my textbook, it is said that, for an ammeter: It is essential that the resistance $R_A$ of the ammeter be very much smaller than other resistances in the circuit. Otherwise, the very ...
118 views

### Parallel voltage source concept

I am having doubt understanding this: If two voltage sources V1 and V2 are connected in parallel with different voltages like 2v and 3v is it possible or the scenario is wrong. An example is this ...
49 views

### Finding equivalent resistance of a complex circuit [closed]

I have a problem which asks for finding equivalent resistance of a circuit which cannot be simplified to a simpler circuit by mere observation. I tried to solve it by simplifying series resistance ...
369 views