9 votes
Accepted

Which temperature sensitive material would be a good choice for temperature measurement from 4K to 300K?

I take it that you don't want to pay for silicon sensors such as the DT-670. Ge resistance sensors have great resolution at 4K but are not so great at higher temperatures (over a balmy 10K or so) and ...
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9 votes
Accepted

Is the resistive component of impedance the same as DC resistance for a given component?

In an ideal world where resistances do not depend on frequency, yes, but in the real world, no. The real part of an impedance at any non-zero frequency (the AC resistance) does not coincide with the ...
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5 votes

Is the resistive component of impedance the same as DC resistance for a given component?

will the resistance component of that impedance, ZcosΦ, be the same as the resistance when that same component is in a DC circuit with the same voltage, R=V/I? No, probably not in anything other than ...
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  • 380k
5 votes
Accepted

High precision resistance meter

You are trying to measure a low resistance of ~1\$\Omega\$ (not resistivity) and (presumably) fairly accurately, perhaps << +/-0.1% I would guess. You're measuring the resistance of both of the ...
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4 votes
Accepted

Should I include the resistance of capacitors and inductors (reactance) in my schematic?

The important question is what do you want to get out the simulation? If you want to see the basic operation, rough idea of duty cycle, peak inductor current, its probably not important to include ...
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  • 190
4 votes

High precision resistance meter

This is not a precision circuit, there are just too many moving parts. That's before you start to critique specific things like too low a target voltage on your resistor, or the resistance of M1 being ...
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  • 140k
4 votes

Why do we take 50 ohm resistance value for unit conversion in Spectrum View in the oscilloscopes?

There are some details missing in your question (especially your scope model) but this could be a general explanation. In your spectrum view (I assume some kind of FFT function) what is the unit you ...
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3 votes

High precision resistance meter

I don't know what your requirements are, but I doubt the circuit could work. Some flaws I can see: The MOSFET has an on-resistance at VGS = 3.6 V of ~0.14 ohm. That is large compared to the signal ...
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  • 1,121
3 votes
Accepted

What are relationship between cable properties and electrical properties?

The module needs a lot of current when it is transmitting, and, it needs the current to be available quickly. If you have too thin wires that are too long, they add too much resistance, and flowing ...
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  • 87.4k
3 votes

Why does voltage reading increase the greater the resistance load?

Your circuit is a voltage divider and behaves exactly as expected. Nothing special about one resistance being called "internal battery resistance". The circuit theory doesn't care very much ...
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2 votes

Why does voltage reading increase the greater the resistance load?

If you had an ideal battery (ie without R1), then you would measure the same voltage whatever the load (resistors R4 and R5). For a real battery, with an internal resistance, you can think of it as an ...
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  • 2,611
2 votes

Should I include the resistance of capacitors and inductors (reactance) in my schematic?

Usually the parasitics and other values are not displayed as it would clutter the design. If you have a component that you know is going to be differing from application to another (e.g. external ...
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  • 2,149
2 votes

How does the common emitter configuration offer higher output impedance?

My recommendation: In general, one should not blindly trust "a person" who tries to explain something in a video. Of course, it is correct that the "material" (ohmic effects?) ...
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  • 22.5k
2 votes
Accepted

Finding the voltage available at the terminals of the battery in a circuit with parallel resistors

21.6V is the voltage across your external resistance, after the internal resistance of the battery. If you are taking the - terminal of the battery to be your ground (0V), the voltage at the + ...
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  • 6,620
2 votes
Accepted

How to determine type of a BJT by using an ohmmeter?

Borrowing from a diode datasheet, you could test each PN junction of the BJT as a diode (using the ohmmeter or the diode test function): You keep one probe of the multimeter fixed to one pin and test ...
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  • 6,138
2 votes

Should I include the resistance of capacitors and inductors (reactance) in my schematic?

Notice that only the elements where the parasitic resistance is critical have this marked. In a switching converter, there are four main places where parasitic elements are important to consider: the ...
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  • 19.4k
2 votes
Accepted

Finding the "drop in potential" as current moves through a single resistor of a circuit with parallel resistors

The 4.8 A flows out of the battery into the parallel combination of 4 resistors. It should be clear that not all of the current flows through the 10 ohm resistor but only a portion. You have assumed ...
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  • 15k
2 votes

Reduce Resistance and Heat Dissipation in a fuse

Fuse losses are often specified rather than resistance for larger fuses. For example this 200A fuse (with your required 100kA break capacity) has a 32W loss at rated RMS current, so the resistance is ...
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2 votes

Is the resistive component of impedance the same as DC resistance for a given component?

Not always. The real component of impedance just represents real, permanent power loss (not energy removed from the circuit and stored to be eventually released back into the circuit in the future). ...
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  • 46.4k
2 votes

Why does adding a resistance in parallel decreases the circuit total resistance?

Here's what Ohm's Law states: 'At constant temperature, the current flowing through a conductor is directly proportional to the potential difference applied across its ends'. If 'I' is the current and ...
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  • 10k
2 votes

How to coat a thin electrical wire with carbon?

An applied carbon coating (sprayed, painted, dipped, etc) is going to have some type of filler material as an adhesive. If the adhesive is conductive it may react (through electrolysis) with the test ...
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  • 5,769
1 vote

How to coat a thin electrical wire with carbon?

Since it appears that you want to maintain electrical contact between your electrical conductor and the bacteria culture solution you may want to consider getting some carbon coated strip that you fit ...
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1 vote

High precision resistance meter

That is not a current source, the current depends on the transistor's Resistance chanel (Trc), the R5 and Rtest. Vdrop = (3.3* Rtest)/ (Trc + R5 + Rtest) Take care that Trc will depends on temperature ...
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1 vote

High precision resistance meter

Your OA1 has 100% positive feedback, so is unlikely to work very well. Putting only 10 mV across your unknown resistor will give you only a very small signal indeed, e.g. for a 1 % change, you get 100 ...
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1 vote
Accepted

GMR Sensor voltage output into magnetic field

These sensors have bridge configuration, so their sensitivity is relative to supply voltage. In the datasheet (page 13) it is written that they are separated into groups by sensitivity. It is measured ...
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  • 176
1 vote

Is the resistive component of impedance the same as DC resistance for a given component?

Is the resistive component of impedance the same as DC resistance for a given component? In general NO, but YES for Conductors, e.g. Inductors always DC resistance in datasheets as DCR. For ...
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1 vote

Finding the voltage available at the terminals of the battery in a circuit with parallel resistors

The voltage between the terminals of the [battery plus internal resistance] is 21.6 V. If the negative terminal of the [battery plus internal resistance] is Grounded, it is considered to be Zero Volts,...
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1 vote
Accepted

Finding resistance for parallel resistors: how is my reasoning incorrect, and what is the correct reasoning?

It looks like you do not see what path the current is taking in this circuit. This may be handy
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  • 12.3k
1 vote

Mimic a thermistor/variable resistance signal using PWM

I think for the first step, if you want to mimic something, you must know what the original one is. As far as I know, the "signal" provided by a thermistor is normally "sensed" ...
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  • 11
1 vote

Calculate JFET resistance

You can't determine it solely based on the gate-source voltage. Small signal JFET like the J201 have a strong dependence on the current (or drain-source voltage), too. If you pass a small current, ...
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  • 10.2k

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