Questions tagged [loss]
The loss tag has no usage guidance.
93
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Resistor losses in heat
I am trying to understand the power lost via heat (friction) from a resistor as opposed to what flows through and is available for the next component in series, and how I estimate this.
I have read a ...
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Power losses in Wire given end load and voltage at load
I'm trying to work out the efficiency of power transmission using a small LVDC system. I'm distributing 60VDC from a point and running it over quite a large cable (3-pair cable, 16AWG up to 500m one-...
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Design calculations for LVDC grid
I'm looking to use 60 V to create a small LVDC grid to power up some small loads - 12/24/48 V maximum. For the purpose of this question I will assume 12 V only loads.
60 VDC will be the power supplied ...
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Maximum DC power available over specific distances from source
I'm working on a small LVDC project using 60 VDC to distribute power over varying distances to varying loads such as network equipment. I decided to work out the maths and see exactly how much power I ...
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Power loss and voltage drop for a parallel wiring system
I'm looking to power a 50W load approximately 140m away using 48V DC. At the far end I will use a DC-DC converter to convert this to 12VDC where it will power a small DC powered network switch I have.
...
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Inductive power capture from AC power cable
How much power could be captured per inch by wrapping a wire around a standard 120V power cable for each amp-hour flowing through it (or whatever reference point makes sense if it's not that)?
Assume ...
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Switching step-down voltage regulator gives lower output-current than input current
I'm currently trying to build a photovolatik cell -> DC Converter -> Battery-management-System. In the early stages of the build I was trying to use the adjustable voltage regulator alongside of ...
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Is charging a capacitor to a new DC voltage fundamentally lossy?
There has recently been a question about switching losses and Landauer's principle entered the discussion. I included it in my answer because I believe, a capacitor fundamentally cannot be charged ...
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Inconsistency of electrical loss function
We have a function to calculate electrical losses for resistances and it is that $$P = I^2 \cdot R $$
If we consider this formula, our teachers generally say that if you want to decrease the losses, ...
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Understanding line losses - how can 1 supply voltage at one end of the line lead to 2 possible load voltages at the other end?
Background
I have a load at the end of a fairly long cable which can accept a limited range of DC voltages. As the acceptable voltages are quite low, I'm expecting non-negligible (read considerable) ...
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Synchronous DC-DC buck converter body diode switching loss
I have a couple of questions regarding the body diode of MOSFET.
I was looking at the calculation of the switching losses in the synchronous buck converter.
For calculating the turn-off switching ...
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Gate driving loss and gate driver for Buck
I have the following question regarding gate driving loss in a synchronous Buck.
When we want to turn on HS or LS we have to charge their input capacitance \$C_{\text{iss}}\$. This is done through a ...
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Voltage Drop using DC transmission over large distances
I'm trying to figure out the voltage drop across a 2.5mm^2 (14 AWG) cable.
The formula I've used is V_drop = (Length in Meters * Current * 0.017)/(area in mm^2).
For a 14 AWG cable I understand the ...
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Flyback diode choice
I am curious about how to determine the turn ratio to get the minimum power loss. Assuming n=Np/Ns Vin=380, Vo=40, different turn ratios can get the same output because Vo =VinD/(n(1-D)).
When the n ...
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Temperature rise in the inductor?
I have a customized inductor which is of E70 core. I would like to calculate the temperature rise in the inductor.
Ac copper loss= 5W, DC copper loss 2.5W, core loss 8W (according to steinmetz). I ...
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Core loss of an inductor
I have been trying to calculate the core loss of my inductor E70 core but I was not able to calculate it. I calculated the operating flux density of my inductor which is 104mT and compared with the ...
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Effect of core losses on inductance in high-frequency LC circuit?
How will the core loss (hysteresis and eddy current loss) in an LC circuit at high frequencies (about 800kHz) affect the inductance of the inductor. When I measure the frequency I can see that it will ...
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How to calculate reduction of inductance eddy currents in ferromagnetic core?
Suppose you have a LC circuit. Now at high frequency the core loss of the inductor meaning hysteresis and eddy current loss will increase. When this happens the frequency increases while the ...
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RF Cable Loss on PCB
I'm calculating the link budget for a rocket communication that reaches 3km altitude.
I'm using HopeRF RFM98W for both ends of the system.
Max RF output: 20dBm
Antenna Gain: 3dBi
3km FSPL at 433MHz: ...
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How can I calculate the worst-case Tj of a MOSFET in discontinuous operation at another Tamb?
I am faced with the task to calculate the maximum junction temperature of a MOSFET in a half-bridge, having conduction losses, switching losses and diode losses. The real difficulty comes from the ...
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Reverse leakage loss in diode
How can I calculate the reverse leakage loss in both diodes (2 switch half bridge rectifier ) ?
I found this equation: \$P_{leak} = (1 + \delta) · I_{rr} · V_{rr}\$.
There is no demonstration.
Is it ...
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Power loss due to mismatch impedance connector in coaxial line
Not being an electronics professional but face the following problem I hope you can help me.
I would like to estimate the losses due to an impedance mismatch of connector used in wall-crossing of a ...
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Is RF propagation path loss symmetrical and independent of clutter location?
Scenario: Consider two measurement points, point one is about 3m above ground level within a cluster of buildings (such as within an office park), and point two is about 1km away with an elevation ...
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Core loss kW/cm³: UNFAMILIAR FACTOR
Looking at a datasheet picture, I assume this is an SI system value Pcv core loss kW/m³.
I haven't found this mentioned in my studying material.
What does it mean?
Also, related question, how come in ...
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Length of wire to calculate its power losses
Let us say I have 12V DC battery and I am using 10m long wire to connect my load with it. Now if I want to calculate power losses in the wire then should I use wire length as 10m or 20m (since there ...
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Which cable connection will result in a greater loss of power?
I know that running a power cable (the cable is carrying 5V DC, I plug in an AC to DC converter to the mains) that is, for example, 50m will cause losses in the power output. So if you measure at the ...
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How to avoid RF signal loss in a conductive cage acting like a Faraday shield?
I have a standard chip antenna mounted on a large ground PCB plane.
The product is unfortunately encapsulated inside a relatively open (carbon-fiber) conductive cage.
Unfortunately, I see an obvious ...
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Can I calculate minimum rise time of a transmission line if I know the length and the loss tangent?
Overview: I am trying to work out if it's possible to transmit my 1.2Gbps MIPI data down a 600mm long flexible PCB strip. Assuming I have the impedance correct, will the signal still be degraded by ...
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High voltage DC point to point transfer
I have a contemplated DC electricity system that has a battery room at a distance from the use. The battery room would be about 150 feet away from where the power is used (for lighting, computer ...
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Where am I wrong about my calculation of power loss?
The power loss of circuit is \$16kW\$ when the power factor, PF, is 0.6 lag. Now if I improve the PF from \$0.6\$ lag to \$0.8\$ lag, what is the power loss now?
The solution provide me the formula ...
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Why will the line loss decrease when the power factor increase?
QA:
If the line loss is \$50\ kW\$ when P.F. is \$0.8\$, now if P.F. become \$0.95\$, what is the value of line loss?
Solution:
\$\frac{P_{L2}}{P_{L1}}=\frac{(cos\theta_1)^2}{(cos\theta_2)^2}=\...
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Why should we multiply Copper loss with \$ (\frac{1}{2})^2 \$, not \$(\frac{1}{2})\$ when the transformer is in half loading?
A 10 kVA transformer, its iron loss is 120 W, the copper loss is 240 W (full loading), now when the load factor is 0.9 delay, what is the efficiency when the transformer is in half loading?
The ...
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Initial current value in capacitor charging circuit
From this video lecture how come the initial current values are different in two cases?
I think they're assuming that the switch resistance is small in the first case.
However how about if they're ...
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Magnetic loss of steel
The software called gprMax which simulates EM waves in varying environments. I am trying to enter steel has material but from the picture, it also requires the magnetic loss(ohm/meter). But I have ...
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What is the "short-range outdoor model (ITU-1411) with a distance-dependent path-loss" mentioned in this paper?
I am reading the paper Graph Embedding Based Wireless Link Scheduling with Few Training Samples, and trying to reproduce some of its results. This paper aims to solve the wireless link scheduling ...
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Power dissipation BJT transistor as voltage follower
Following the discussion from this thread I am finalizing my calculations. I am not sure that I am calculating the power dissipation correctly. Given the following circuit
I need to operate the opamp ...
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Unexpected values from insertion loss calculation in IEEE P802.3cg documentation
I'm looking at the insertion loss calculations from an IEEE document on P802.3cg (10SPE Ethernet). On pages 6 and 7 they talk about insertion losses over the cabling in a multi-drop scenario.
I'm ...
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Coax cable loss drops by approximately 0.5 dB at a specific frequency
I am trying to understand why the measured loss of our coaxial cable is decreased exactly at a specific frequency. My understanding is that the loss should be linear with the frequency. However, there ...
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Reading core loss graph of an inductor core
The question is somehow unrelated but I hope someone answers,
From the above graph, how can I get the value of 0.3T line @ 25kHz ? The scales in the axes confused my mind.
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Insertion Loss & Return Loss - GSML2 Link
I have a GSML2 Link specification connecting Serializer and Deserializer via coax.
While performing the SI analysis, I had a few doubts.
In the deserializer datasheet, we have forward channel of ...
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Pulsed power calculation
I want to calculate power loss across a resistive load during a 1 ms interval. The experimental setup is such that the voltage and current through the load varies the whole period of 1 ms. I have 10,...
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Why do we use low resistance cables to minimize power losses?
Generally, one would like to minimize power losses via Joule heat. Intuitively, using low resistance cables (for example by using materials with low resistivity like copper) should do a better job ...
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Find rotor stator loss in a three-phase delta-connected induction motor
I'm trying to work out stator input power of a three-phase delta-connected induction motor.
I have the equation Stator Input Power (P1), where P1 = Pm + rotor copper loss + rotor stator loss.
I have ...
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What causes power losses in transmission lines?
From my understanding there are two causes for power losses in transmission lines:
Losses due to resistance:
\$ R = \frac{\rho l}{A} \$, where \$\rho\$ is the resistivity, \$A=\pi r^2\$ and \$ l \$ ...
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what does Loss Tangent means in capacitor?
As we know the definition of Loss Tangent in capacitor which it is:
When a sinusoidal alternating voltage is applied to an ideal capacitor, the current advances by pi/2 in phase. In the case of a ...
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HC05 Bluetooth Ping without losing connection
I am currently working with the Bluetooth module HC05 using a Teensy 3.2 board. I successfully established a connection between the laptop and the board using Bluetooth. I can send data from the board ...
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Can't achieve the goals in designing and simulating Resonator circuit
Goals
I need to design resonant parallel circuit and simulate it with LTSpice so that it match with the design requirements correctly.
Requirements
Source Impedance \$R_s = 100\ \Omega\$
Load ...
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Dielectric Loss for Constant Impedance
Are dielectric losses the same for two different 50ohm structures that are built in the same dielectric medium?
Eg. Two 50ohm Stripline traces in FR4 where one is very skinny with close GND planes, ...
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Calculation of transmission loss of a power plant
What is the transmission loss due to heat if my power station produces electricity at a power of \$5 kW\$ and the electricity consumer is \$1 km\$ away?
It is a copper line with a material constant ...
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Ohmic power loss due to electric field
Recently I read in the basic EM theory course , that the Ohmic power dissipated in a conductor is directly proportional to the conductivity and the square of the electric field intensity , but we know ...