Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [energy]

Energy is defined as the amount of work that can be performed by force, measured in Joules. Energy is Power over Time. This is a poor tag to use. Please consider if your question relates to Energy as defined in physics, not as a synonym for Power or capacity.

0
votes
3answers
46 views

MW of installed capacity

I am conducting research on wind turbines, specifically into how many hectares wind farms use. I have come across the phase 'installed capacity'. If wind farms typically use up 10 hectares per ...
0
votes
0answers
18 views

creating artifical neutral point in delta connection

I am trying to measure 3 phase 3wire and 3 phase 4 wire L_L voltage and L_N voltage.Circuit i am looking is common for both. In star connection i will get an neutral point for reference to read the ...
7
votes
2answers
920 views

How can I deduce the power of a capacitor from its datasheet?

I am looking for suitable capacitors for a sound amplifier I have designed. The speaker power should be at least 7 watt (for the sound to be loud enough). (I attach a figure of the design) So, I ...
1
vote
4answers
127 views

Active Energy, Reactive Energy or just Energy?

I understand the concepts of active power, reactive power and apparent power. I am not sure I am getting the complete concept about the respective energies. I am using an energy monitor to record ...
1
vote
1answer
24 views

Temperature dependence of the energy bandgap and Simulink way

I know the equation about the temperature change of band energy but Simulink must find another way to define it like below. dEg=-2.677 10^-4 I can't find a single reference about that equation. ...
0
votes
1answer
58 views

Supercapacitor for Wind Energy

I am building this wind turbine project and the problem I am facing is the irregular winds that does not keep the inverters running continuously. I initially decided to solve this problem by employing ...
9
votes
6answers
3k views

Why don't we think about battery storage for all sources of electricity on a utility scale instead of just renewables? [duplicate]

One of the repeating solutions that comes up when talking about renewable energy power generation and the intermittency of it is battery power storage. This has got me thinking, it takes hours or ...
1
vote
2answers
64 views

Photodiode Output measurement

I'm using Hamamatshu s8559 photodiode to convert x-rays into it's respective energy. I'm using a 10 bit ADC converter. The problem I'm facing is I have no relationship between the Photo-current ...
0
votes
1answer
19 views

Peak Period Forecasting in electric grid

I am currently working on the day ahead load forecasting using a regression model over a microgrid level. I wanted to know is there a way I can detect peak period i.e period where demand is high from ...
0
votes
2answers
72 views

Hspice does not give correct energy consumption for a RC circuit connected to a DC supply

Here is the circuit I am trying to simulate - a RC circuit driven by a DC voltage source. I measure the output across the capacitor. Assume Voltage source is 1 V. Assume capacitor is 1fF. Case 1: ...
1
vote
0answers
22 views

permanent magnet synchronous motor Lagrangian in qd0 frame

I'm trying to derive a symplectic model for a permanent magnet synchronous motor (PMSM) in the rotating qd0 reference frame using a geometric integrator. For that purpose, I need the discrete-time ...
0
votes
3answers
46 views

Is there an industry standard definition for “load”?

I come across load meaning either power or energy from time to time in the context of residential loads or load forecasting. As such I was wondering if there is a convention as to whether "load" more ...
0
votes
2answers
60 views

Graphical nature of signal energy

In signals, we learn that the energy of a signal is the integral of its square. E.g. \$E=\int_{-\infty}^\infty x^2(t) dt\$ We know that integrals are the areas under the function in a graph. But ...
0
votes
0answers
17 views

LLC converter HF transformer

I am searching for a suitable transformer core for my project of LLC converter. Lr and Lm inductors should be built in primary windings. I built a LLC converter with 3 outputs in the power range of ...
0
votes
1answer
26 views

Time it takes for B to go to zero with R and L given

Given that your solenoid has inductance L and resistance R with initial current I such that there is uniform B inside the coil, I would like to figure out how much time will pass before B goes to zero....
0
votes
0answers
48 views

How to safely switch a big inductive load with a Triac using a capacitor snubber?

I am building a Spot Welder with a big powerful transformer. I have to switch a big inductive load of 70mH (input of a transformer) The switching will be done with an SSR (Opto Triac Zero crossing SSR-...
0
votes
1answer
20 views

Why are thresholds for energy detection and preamble detection different in 802.11 standard?

Assuming a 20 MHz band, it is -62 dBm for the data and -82 dBm for the preamble. Source: August 2013 doc.: IEEE 802.11-13/0994r0
0
votes
2answers
70 views

What is the effect on kWh if the power company reduces line voltage to a residence? [closed]

We just received our power bill and it is showing a 30% rise in kWh for the past month. Nothing has changed in our home. We were even gone one full week in the month. To make it more interesting, ...
0
votes
0answers
35 views

how to compute battery charging power

I have a very basic question about battery charging power. In a very simplified scenario, assume a battery with voltage 3.7 is connected to another rechargeable battery with voltage 3.2 which results ...
2
votes
0answers
57 views

RS485 registers for calculating total power consumption (kwh)

I have an energy meter (OHIO A2000) which has been now discontinued by the manufacturer. Anyway, I'm following the manual for extracting energy parameters through Modbus RS485 communication. I'm ...
1
vote
1answer
60 views

Determining Battery Charging and Discharging Rate Based on Max Current and Nominal Voltage

I am having difficulty in figuring out some basic stuff and confused with multiple equations. I am working on a simulator which simulate a hybrid vehicle journey for some period of time. During ...
0
votes
1answer
30 views

About parallel circuit [duplicate]

Consider a power source supplying 240 v 50/60hz 6amp I know that there is nothing like it but I chose that for my comfort of understanding now if I connect 15 loads drawing 240 v 0.35 amps in parallel ...
0
votes
2answers
51 views

In AC circuit will there be a voltage drop or current drop [closed]

For reference purpose consider an AC voltage source of 240v 1amp and there are 3 loads connected to same 240v line one consuming 600 milliamps and another one consuming 300 milliamps.now if i add ...
1
vote
1answer
48 views

How is the energy consumption of a ciruit component calculated?

I know that watts are equal to amps times volts, and that watts are a rate of energy consumtion. I have looked at some circuits, but I am unsure of how the total energy use is being distributed. My ...
5
votes
4answers
709 views

Relationship between I2C drawn energy / power consumption and data rate

Referring to just what the I2C lines draw, am I wrong thinking that the higher the clock frequency the shorter the time there will be (the same amount of) current flowing through the pullups and thus ...
1
vote
2answers
57 views

Do “standby switches” consume energy?

Suppose I have a TV plugged in and it is connected to a power outlet which is also turned on. This appliance is "turned on" and on "stand by mode". It consumes energy I think just to light up that ...
0
votes
1answer
37 views

Instantaneous power consumption value

If, for a large motor, you are given cumulative kWh values at 5-minute increments, how would you determine an instantaneous power consumption value?
2
votes
1answer
47 views

Hamiltonian-inspired energy function for power grid stability

I'm looking at this paper which proposes an energy function for a 3-bus power system example. I'm trying to replicate the results in the paper but am uncertain about the ...
1
vote
1answer
137 views

Is electricity saved by switching off the lights when leaving a room? [closed]

Incandescents are very energy inefficient for sure so they have to be turned off whenever you leave the room. But I have tried to find the answer for CFL lights, some say that it's more efficient to ...
-3
votes
1answer
70 views

Can I use a USA Led Bulb in Europe? [closed]

I am a software engineer working with an IOT company in the states, Right now I am located in Europe for a month and a half, and have some hardware (light bulbs) that I need to use to finish some ...
0
votes
1answer
202 views

Battery Charge and Discharge Time

I am doing a case study on battery back up of a wind system with the following specification: System size: 10 kW which runs continuously for 5 hours per day. Battery Calculations: Battery type: ...
-5
votes
2answers
67 views

Electrical energy saving [closed]

"You can not pay for the light! This CUTE for years was..." I wonder, what will happen if to do what is illustrated on the picture. I think there are two cases: Hot terminal of left outlet connect ...
0
votes
2answers
1k views

How to compare mAh to Watt hours?

I have a laptop with a battery described as: 3 cell Li-Ion 57Wh I would like to know how this compares to a powerbank with 26500 mAh capacity. How do you perform these kind of comparisons? What ...
1
vote
0answers
109 views

Is there a theoretical performance limit for Lithium Ion batteries?

Is there a theoretical performance limit for Lithium Ion batteries? I'd like to compare energy density of Petroleum Products based upon what limits can be obtained from stored energy in Lithium Ion. I'...
0
votes
1answer
154 views

Calculating energy of transient/surge handled by metal oxide varistors (MOV) or surge suppressors?

As I get to know more about the MOV operation, there are more things needed to understand. My MOV (V420La20AP) has Varistor voltage of 680 Vrms (10%) at 1 mA, and maximum clamping voltage of 1120 V ...
0
votes
2answers
152 views

How does programming code provide power to electronic circuits? [closed]

I've been thinking about a question and haven't been able to find an answer. The question is that: For instance, an Arduino has a 5V output pin to feed any electronic component. When you code ...
0
votes
1answer
100 views

Dual axis solar tracker with singlr LDR

I'm working on dual axis solar tracker project, but the task I was given was to make a solar tracker work with a single LDR (Light Dependent Resistor). The LDR would be placed in a pipe which is ...
1
vote
2answers
97 views

In an ideal transformer circuit, how is power transferred?

If I have a system of circuits like this: where Circuit 2 is providing power the Circuit 1, where does the energy come from? Do the inductors store energy? If not, how is power transferred from the ...
0
votes
1answer
116 views

How much capacitance/joule/watt is needed on average household' energy storage system with supercapacitor?

I am on the process of making assumption how much capacitance/joule/watt is required on average supercapacitor as household' energy storage system. I plan the design for energy hub to be charged by ...
0
votes
1answer
79 views

If counter-emf is zero, why is COE violated?

I've been modeling this thought experiment a for a while now: If in a electromagnetic system, the induced emf wasn't opposing the change, but increasing it, we're getting energy from nowhere, that ...
1
vote
1answer
81 views

How does electrical signature devices work when there is more than one load connected?

Now more than ever I see energy monitoring devices like this one that uses "AI" to detect the loads connected to your home electrical network, like the washer or a hairdryer. These devices use ...
1
vote
4answers
105 views

Is it really that the electrical energy consumed by a resistor totally transform to heat energy?

My notes say that electrical energy and power consumed by a resistor is totally transformed to heat energy. Is this true? Or could it be transformed into also some other kind of energy?
0
votes
2answers
60 views

How to model electric power consumption in verilog-a?

I am modeling an analog device using verilog-a (to which I am quite new). I would like the model to match the power consumption of the physical device, for which the energy cost associated with state ...
0
votes
1answer
2k views

What is the difference between inductive coupling and resonant inductive coupling?

The resonant inductive coupling is better than inductive coupling, the difference between them, is that resonant inductive coupling use the "resonance" in their favor. But what is the difference in ...
3
votes
2answers
169 views

How does the diagram really work? [closed]

Good afternoon, I am a high school student and in my scientific fair project, I would like to do an experiment about wireless energy. I want to implement the resonant inductive coupling. According ...
0
votes
1answer
67 views

What does the 20-80A rating on an energy meter mean?

On the energy meter nameplate is a current rating 20-80A, which I can assume has something to do with max current. I'm particularly interested in the "20" part, though. What does this rating mean? I ...
0
votes
1answer
61 views

267 3MW wind turbines can produce 960MW?

WINDFARM PROPOSAL In the proposal above, it states that 267 3MW wind turbines are used to provide 960MW. but using a very simple calculation: 267 * 3MW=801MW. So how is it that the windfarm is ...
0
votes
1answer
80 views

What does a 10MW wind turbine mean?

So if a wind turbine has a capacity of 10MW, what does that exactly mean? does it produce 10MW every hour, or is it the peak power it can generate at any time? the following question is how to know ...
0
votes
0answers
96 views

How to deal with low pass filter questions if Fourier transform of signal does not exist?

I found this question in a previous test paper: I'm having a few confusions: 1) Low pass filters are supposed to block signals below a certain frequency. Here that certain frequency is \$w_c=a\$. I'...
2
votes
3answers
111 views

Faradays law of induction - where does the energy for the current in second loop come from?

Lets say each of the loops have the same resistance \$R\$ and the emf of the battery is \$V\$. Case1 : There is no second loop. Then if I close the switch for \$t\$ seconds, then the energy supplied ...