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.

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I've designed a new style of ac alternator where both the stator and the rotor rotate oppsite directions so that rpms multiply by each other [closed]

My body of information is on a youtube video of nothing more than a hand drawn picture. In explanation of my actions I did this to publish to establish prior art. What I'm curious to know even if its ...
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2 answers
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Battery capacity and parallel vs. series battery connections

Say you have 4 200 Ah 12 V batteries connected in parallel, this as I’ve come to learn increases the amp-hour value and not the voltage, and say you have another system same as that but connected is ...
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Why can't current change instantaneously in a given inductor?

I know the mathematical reason behind this. Given the inductor I-V characteristic we know that: I understand mathematically that a function which is differentiable must be continuous, but what is the ...
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How is energy conserved in an LC tank with voltage offset?

Consider an ideal LC tank oscillator offset by an ideal battery*: The core question is this: is the energy balance here maintained by the charge-voltage relationship of the battery? Energy seems to ...
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Energy cost conversion [closed]

If electricity costs $0.06 per kilowatt-hour and is used for electric heating with an efficiency of 100%, what is the equivalent price of natural gas per gigajoule if it can be burned with an ...
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Magnetic energy harvesting with a current transformer

I am planning to design a magnetic energy harvesting circuit with a current transformer (CR8349-1500) to charge a super capacitor. Load current rating is 0 to 35 amperes. From the current transformer ...
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Convert kWh during a 1 hour period to average 15 min kW output

If I have a photovoltaic system that outputs 100 kWh from 1PM - 2PM on a given day and I am trying to figure out what the average 15 minute kW would be during that time period, would that be equal to ...
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How to calculate watt hours gained charging battery?

I need an estimate of how many watt hours a battery has gained after charging to a certain number of volts. With a 12 V, 50 Ah lead-acid car battery, charged from 12.5 V to 13.0 V, is it as simple as ...
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3 answers
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How is a sleep mode of a micro-controller realized? [closed]

How can a micro-controller save energy? What does it mean if the micro-controller throttles its CPU? How can a micro-controller "turn off peripherals" that are not needed to save energy? I ...
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What does "highest ionizing energy deposition" mean?

I am looking for how to compute the thickness of shielding materials and have found the following research: ISNPS Technical Report ISNPS-1-2013 Tai and El-Genk.doc (unm.edu) The report is mentions the ...
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How to measure energy usage from a 12V battery over a daily pump cycle

I am working on a project right now where two different DC water pumps are being powered by a single 12V DC battery. I am trying to do some performance testing to find how much energy from the battery ...
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"Power Loss" in the Definition of Q-factor from wikipedia [closed]

The stored energy definition of the quality factor \$Q\$ from wiki Q-factor from wiki is given by $$ Q = 2\pi \frac{\text{energy stored}}{\text{energy dissipated per cycle}}= 2\pi f_0 \frac{\text{...
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Where does all the electric energy get dissipated in any electrical system?

I know that some portion of the electrical energy is dissipated as heat due to the efficiency, but where does the other energy go? If we are talking about a satellite in space, all of the electrical ...
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Real time server monitoring

First of all, I hope I am posting my question on the right place. I am looking forward to any possible advice. I am using a Dell server (model: PowerEdgeR710) and I saw that on the LCD panel the ...
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3 answers
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How much electricity can be generated from stove's heat?

Yesterday I asked a whether it is profitable to put a thermoelectric generator (TEG) between a stove and a freezer regarding electricity terms. I was missing a point, which was that heat was being ...
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2 votes
2 answers
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What if we attach a TEG between a freezer and stove?

I have been thinking about this, that if we attach one part of a thermoelectric generator between a freezer and other part on a stove. This would create a temperature difference and generate ...
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1 answer
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How to (theoretically) capture 59 megajoules of power in 5 seconds to store like a battery for a month? [closed]

On Dec 21, 2021 EUROfusion Scientists in Culham, UK produced 59 megajoules in 5 sustained seconds from their nuclear fusion experiment. What theoretically would be required to capture that energy and ...
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Why multiple series resistor on single phase metering reference design with HLW8012 and BL0937 IC

We need to implement energy monitoring in our smart plug. We are considering 2 ICs HLW8012 and BL0937 for this purpose and following are their reference designs in their data sheets. I am trying to ...
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How to understand information as energy?

Cpu or gpu making calculations and creating information (decrease in entropy) is converting 100% of energy it pulls from the wall into heat. How should we understand the created order in terms of ...
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How does direct piezoelectric effect convert mechanical energy into electrical energy?

I am studying direct piezoelectric effect and if I understand it well the idea of direct is that if we apply force in an hexagonal cell unit for example, we create a polarisation, but how do we ...
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can we trade off electric power for time?

The voltage and current are exchangable for a constant power. Can we increase the power of the source by decreasing the time of the supply ? From this equation Power = Energy / Time The total energy ...
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6 answers
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Why is the energy in a battery QV, but the energy in a capacitor QV/2

If I know the total charge in a battery, let's say 5000 Ah, and I want to find how much energy is stored in the battery, I multiply the total charge by the voltage E = Q·V; for example, for 12 V I ...
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1 answer
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Possible problems of AC energy metering using rectified waveforms

I'm building an energy metering circuit with discrete parts and precision is not a big deal in this case. One friend had the idea of rectifying both the voltage and current waveforms before sampling ...
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6 votes
3 answers
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Does an EEPROM consume power only during the transition edges or during entire read/write cycle?

Iam trying to simulate the loading behavior of an EEPROM. It is powered by a 5V LDO. When would the EEPROM actually consume power? Does it consume power during the entire read/write cycle time? As ...
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The probability that an electron occupies the fermi level at 0K

I was trying to find the probability that an electron occupies the Fermi level at 0K. Fermi function: {exp[(E-Ef)/kT] + 1}-1; (k = 8.314 J/mol/K) According to my calculations, the answer would be 0.5. ...
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Where is my capacitors energy missing?

To avoid "mistakes", may I recall that, mathematically, \$\infty \times 0 \$ can be ... finite! Otherwise, why use a Dirac impulse? After reading this and this, I have yet a "question&...
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Does DC energy propagation speed depend on current? What about AC?

I understand that the speed at which energy propagates from the source to the load is much faster than the drift velocity and current of the electrons in a wire. I am wondering if the magnitude of the ...
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1 answer
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Leaving the plug attached to the socket [closed]

It would be really helpful for me to leave the USB plug (the "brick") plugged into the power socket. I would not connect the cable, which could potentially short if it touched a conductor, ...
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1 answer
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What does it mean by "in the range of 1000:1" for an accuracy of 0.2 in energy metering?

Most of the time whenever I come across electricity metering or CTs, there is always a term like an accuracy class e.g. 0.2, 0.5, 1, 2, etc. I have an idea about what this accuracy class means. But ...
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Programming - battery energy logging; creating negative and positive data output from a single sensor

I'm using a single bidirectional Hall effect sensor to read the current coming to and out of a battery, but an application requires 2 separate sensors; one for incoming and 2nd one for outgoing energy....
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2 votes
3 answers
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Calculation for energy consumed over a period of 24 hours

I'm currently studying the textbook Fundamentals of Electric Circuits, 7th edition, by Charles Alexander and Matthew Sadiku. Chapter 1.5 Power and Energy gives the following practice problem: ...
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10 votes
4 answers
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How to shunt 1500 joules when voltage exceeds 75 VDC

I have an alternator that charges at ~58 V at 100 A. If its load (a lithium bank) cuts out suddenly (bms cutoff), I need a way to shunt power for 200 ms to a dummy load to prevent the current from ...
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2 answers
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How much energy is lost by a capacitor regulating a voltage regulator? If you increase the size of the capacitor, how does this change?

An ideal capacitor loses no energy while regulating the voltage provided by a DC regulator, if the regulator keeps up. No capacitor is this ideal. In the real world, the capacitor will lose voltage as ...
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2 answers
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What does energy meter class 0.2S , 0.5S, 1S means?

I was checking the datasheet of an energy meter IC (Atmel M90E36A) and found an application saying " Poly-phase energy meters of class 0.2S, 0.5S and class 1 which are used in three-phase four-...
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2 votes
3 answers
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How does voltage operate in an electric circuit regarding conservation of energy? [closed]

I hope you all are having a great day. I have some questions regarding the physics of a closed electric circuit on a microscopic level. Specifically, how energy operates and how voltage is "split&...
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1 answer
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Finding the PPF and PPFD using a LED data sheet

I would like to design my own grow lights to grow indoor plants like strawberries, herbs, etc. But I have a problem that I need some help to work out: How many LEDs do I need to light up an area of 0....
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2 votes
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Reactive power and eletro-mechanical analogy

Regarding this question, I will try to use the analogy of the differential equations $$F = m\frac{dv}{dt}$$ and $$V = L\frac{dI}{dt}$$ and $$w = \int Fv dt$$ with $$w = \int VI dt$$ to figure out the ...
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0 votes
4 answers
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kilowatt hour and kilowatt per hour

Electric energy is sold by the kilowatt hour (kWh). A kilowatt is a unit of power. A kilowatt hour is a unit of energy. It's the sum of power consumption over a given period in hours. As in example, ...
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Ballpark energy consumption per state transition for a D-flipflop in a modern chip manufacturing process?

For a D-flip-flop in a modern yet-not-too-extravagant chip manufacturing process (let's say 28nm or 40nm), what are some ballpark figures for the energy cost per switching H->L or L->H one can ...
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Energy consumption Calculation

I work for a food processing plant and working on a project that calculates energy consumption. Am having a hard time converting information given by the manufacture to calculate the average kWh. ...
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2 answers
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Is it possible to write a program that calculates its own energy usage?

If I have a program (e.g. a small Python program) on a specific machine. Would the program be able to measure how much energy its computation costed? I think, there would be two possible ways to go: A)...
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Charges and a car battery [duplicate]

On face value so to speak when looking at a car battery, it can perhaps be easy to think that on the positive terminal being positive and protons are positively charged particle must be full of ...
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How can I find out energy density from battery (current) capacity, in amperes-hour [Ah] and battery voltage, in volts [V]

I want to know the energy density of the battery. I only have details from here on page three & four 72V battery pack and Usable capacity of 266 Ah How do I find the energy density of the battery?
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1 answer
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How to find mAh rating of battery for my project?

I am using a NodeMCU ESP8266 for my project. The datasheet says it consumes 170 mA in active mode, and approximately 10 milliamperes in sleep mode. In my project, the NodeMCU runs 1 minute in active ...
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Battery cost LCOE and carbon emission by hourly. Validation of calculation approach

I am compiling a report and trying to validate my understanding of using power correctly to multiply with constants like price and emission in kg weight. Please point out if the approach below is ...
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3 votes
1 answer
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Is there a linear relationship between energy production and global horizontal irradiance?

I'm an apprentice in data science. I am currently working in a company that produces and installs energy storage systems. One of the clients of this company wants to estimate the loss due to the ...
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4 votes
2 answers
135 views

Energy efficiency in an electrical circuit

I’m in high school and we are going to do this laboratory in which we will have to make two solutions at different concentrations and determine which has the greatest electrical resistance in a ...
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How does the grid handle small deviations of power consumption when most of load is regulated?

This is a continuation of this question. Suppose we have a grid which distributes say one gigawatt total power and all this power is perfectly fully consumed by electrical devices. However all ...
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Are PV panels convenient without incentives?

I finally finished a project in which I designed a 55 kW of PV system for a 50 kW load and I finally calculate costs and revenues over 20 years. I found that with a 25% of incentives for the cost of ...
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How to calculate energy from power I receive every 5 minutes

I have to calculate energy from power measurements, which I receive every 5 minutes. The values are summed and assigned to measurements, then monthly measurements and finally yearly measurements. ...
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