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Questions tagged [electrical-resistance]

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

The tag applies to electrical resistance. It also applies to e.g. resistors, electrical resistivity and conductivity, and electrical impedance. DO NOT USE THIS TAG for non-electrical resistance, such as, e.g., air resistance.

2745 questions
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What is the resistivity of copper at 3 kelvin?

I couldn't find the value of resistivity of copper at 2.73K on google
AJK
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Body's Electrical Resistance

I am not someone specialized on physics, I am just curious on why our Body Electrical Resistance measure as shown by a multimeter varies so much. When allocating the 2 probes each on one hand, the resistance varies from low 100k's of Ohms up to 700k…
camiloqp
  • 153
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How to locate the Oil-Water-Contact (OWC) from resisitivity log? What is enough abrupt change in resistivity from resistive gas to conductive water?

This is a real petrophysical log analysis chart with resistivity logs (laterolog log on the last row with rainbow plots and induction log on the second row with red, orange, purple lines) and little relevant first row with PEF to this question. I…
hhh
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Does high resistance imply low power consumption in household appliances?

As we know that, the voltage in households are fixed, so for a particular appliance, will increasing the resistance decrease the power consumption rate according to $P=V^2/R$ ?
green_32
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Resistivity of non-ohmic materials

Is resistivity of non-ohmic materials constant with constant temperature, or it depends on some other factors as well? I'm aware that for non-ohmic devices, the ratio V/I is not a constant which means that the resistance (R) is variable, but from…
Aspirant
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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", which I don't know exactly. And the paper shows…
Long
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Charge accumulated at two ends of resistor/inductor?

In a simple circuit are there any charges accumulated at two ends of resistor? There is an conservative and thus electrostatic electric field and potential difference across the resistor. It seems it is only possible if positive and negative charges…
Kelvin S
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How does a resistor work?

How is it, that a resistor can physically resist current? Do electrons collide with the materials lattice which is what causes resistance?
MTGOD
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Is zero input impedance good or possible when considering impedance matching?

For RF applications, we are usually considering of impedance matching to choose load impedance as the conjugate of the source input impedance for the maximum transferred power. But how about design the source having zero input impedance? Is it even…
george andrew
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low conductivity material compatible with MRI

I am looking for a conductor with low electrical conductivity (around 1 S/m) which can be moulded into a mask.
Hars
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Will any charge flow in this circuit?

I had to find the resistance of this circuit between A and B. My teacher said that since the blank wires have zero resistance, the potential difference across the ends of the blank wire is zero(according to v = ir) and thus 1,4 are equipotent and…
MrAP
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Birds don't get electrocuted on live wire

Why is birds which stay on electrical wire which current is being pass through doesn't get shock?
Olusa Toby Macduff
  • 19
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Determining the resistivity of gold and copper alloy

Say we got an alloy made of $90$% Au and $10$%Cu. The atomic mass of gold is $$A_{Au}=197g/mole$$ and of copper $$A_{Cu}=63.5g/mole$$ The specific resistivity of gold is $$\rho=22.8n\Omega m$$ and the Nordheim coefficient is $$C=450n\Omega m$$ Then…
Emir Šemšić
  • 63
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Resistance in closed Circle

A wire of resistance $10 \Omega$ is bent in form of closed cirle. How do I find resistance across its diameter. Please don't consider this problem as homework question, just provide some hints, and make the problem clear, i.e. if we had to bent wire…
mnulb
  • 299
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Relationship between thickness and resistivity of thin metal films, finding the characteristic thickness and the cut off resistivity

I’m working on a lab report on the relationship between thickness and resistivity of thin metal films. I collected data that was approximated to the 2nd order exponential decay equation: $$7\times 10^{-5}\exp\left(\dfrac{-x}{3.0453\times…
Morg Man
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