# Questions tagged [loss]

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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 ...
• 201
37 views

### 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-...
61 views

### 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 ...
383 views

### 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 ...
1 vote
151 views

### 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. ...
154 views

### 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 ...
• 121
132 views

### 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 ...
1k views

### 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 ...
• 12.3k
116 views

### 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, ...
• 3
192 views

### 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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121 views

### 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 ...
• 33
363 views

### 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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311 views

### 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 ...
98 views

### 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 ...
• 359
1 vote
144 views

### 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 ...
169 views

### 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 ...
1 vote
429 views

### 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 ...
• 37
1 vote
94 views

### 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 ...
• 37
89 views

### 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: ...
• 53
107 views

### 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 ...
• 660
230 views

### 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 ...
92 views

### 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 ...
28 views

### 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 ...
235 views

### 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 ...
229 views

### 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 ...
• 139
343 views

### 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 ...
• 1,423
56 views

### 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 ...
93 views

### 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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30 views

### 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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122 views

### 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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