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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30 views

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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Converting between MMBTU and MWh [migrated]

a quick question: I want to convert between MMBTU and MWh to get at emission factors from energy. I have the following information: I use the data given in 40 CFR 98 (see EPA source here) by the EPA ...
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2answers
51 views

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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4answers
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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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45 views

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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2answers
123 views

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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1answer
95 views

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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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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42 views

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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1answer
167 views

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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2answers
85 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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1answer
51 views

How is heat generated to start combustion in an incinerator?

I see many diagrams on the internet that show a layout diagram of an incinerator that has a combustion chamber connected to a boiler or gas turbine to capture the energy mechanically or generate ...
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2answers
91 views

Do kinetic energy and inductor energy violate conservation of energy?

I posted this question on the physics page. I feel like it might be better suited to this site, though. Suppose we have an ideal LC circuit (no resistance) and an open switch where the capacitor has ...
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2answers
59 views

Lighting System in terms of its efficiency and consumption

I'm curious regarding some matters in my experiment session of Efficient Lighting System. There are 4 types of lamps which we measure the data to fill-in the table as in the picture. Correct me if my ...
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1answer
112 views

What is the exact meaning of 0.7V voltage drop in a forward-biased diode?

this question is partially (but not totally) discussed here: Why do diodes have a voltage drop? Does the power drop on a diode become entirely heat? The conclusion is that, in a forward-biased diode ...
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3answers
629 views

Convert 15 minute kW readings to a monthly kWh total

I have metering data (kW) in 15 minute intervals that I am trying to get a monthly kWh total for... I simply summed the entire kW range, then multiplied it by hours in the month 745 (total number of ...
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NEPLAN Load Flow Analysis with 1-day measurement

currently I am working on a project to identify energy loses in an electrical network. I am using NEPLAN 10, and already build a small system and implemented measurements. As soon as start the ...
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1answer
29 views

ATM90E32AS Power calculation

My application requires a energy meter so i interface a ATM90E32AS energy meter IC with dsPIC microcontroller. when i gone through the data sheet it was really confusing about power calculation. As ...
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1answer
51 views

What does C mean in terms of an energy calculation

I'm a bit of a noob when it comes to EE, so this might be a dumb question, but I find it super interesting and am learning as fast as I can (1) I saw the following formula on another forum: "E = ...
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2answers
71 views

Energy of flyback with multiple outputs

Where does the additional energy for flyback with multiple outputs come from? It appears that I can add as many secondary outputs as I want, but the primary voltage is Vin, and the primary current can ...
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3answers
218 views

Intuitive way of "visualizing" how the energy is stored in an inductor?

I've been trying to more or less understand intuitively how energy is stored in an inductor, but I don't seem to get anywhere decent. In a capacitor I understand, I believe: an external battery pushes ...
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7answers
219 views

Is there such a thing as a 'Constant Power Source'?

Academic question: Is there such a thing as an electrical constant power source, which delivers energy at a fixed rate? Specifically ... there are voltage sources and current sources, which maintain (...
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4answers
55 views

LTSpice sweep resistance

I would like to plot the power obtained by this simple recovery circuit (UR1eff^2/R1) according to the value of the resistance R1. But as it is a sinusoidal function, it takes the average value of the ...
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SSHI circuit on LTSpice

I've been trying to get an SSHI circuit running on LTspice for several days now (see below schematic). My problem is the following: the simulation (.tran) stops after a hundred milliseconds. Being a ...
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1answer
191 views

Energy meter neutral current measurement

I was reviewing an energy meter specification and I came across neutral current measurement. What is the importance of neutral current measurement in an energy meter for three phase power supply? I ...
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230 views

Why can't we use magnets to create energy like this?

Won't it rotate continuously? Why can't this happen? Energy cannot be created, right? Then will the magnets degrade over time and stop being magnets? But they don't have their own energy also. Then ...
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423 views

Problem in Computing the Energy in Energy Meter using ESP32

So me and my groupmates are been working on with our thesis project about energy meter. In our project, the esp32 is the main board we are using. We also have voltage sensor (ZMPT101B) and current ...
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What depletes batteries

I recently learned how how energy actually flows in batteries, the electric and magnetic fields create an energy vector pointing into the circuit at all points and out of the battery. This broke my ...
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1answer
61 views

Power and current contradictions in transformer secondary

Two contradictions that I couldn't find a solution for regarding a transformer: For an ideal transformer, from conservation of energy we can say that: V1 * I1 = V2 * I2 Where V1, I1 are the primary ...
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1answer
91 views

Can I charge a 16V 16.6F supercapacitor with an 18V solar panel?

I'm working on my calculus project (I recently started college) and my topic is using solar panels and supercapacitors to help mitigate the lack of energy/electricity in the rural areas in my region. ...
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5answers
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Voltage drop through a resistor for a single charge, contrasted to a non-ohmic component

Recently I have been reading about how transistors and diodes only drop a limited amount of voltage across their leads for a wide range of currents. So the voltage drop per charge (at a given ...
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4answers
130 views

Energy conservation when adding braking resistor to H bridge?

This may be a stupid question but I'm missing something fundamental about energy conservation of electrical machines - I am sure I have forgotten something from basic machine theory but I haven't ...
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Impact of reduction on Dynamic energy and dynamic power in microprocessors

A microprocessor has been designed to have a dynamic switch which reduces power consumption when the loading reduces. Assuming a reduction of 20% in voltage reduces clock frequency by 20%. Calculate ...
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Calculate residual energy in rpl.mhrof.c code in cooja

I'm working in develop of rpl protocol I want to calculate residual energy in rpl.mhrof.c code in cooja, some one here know the c code of residual energy of the nodes please?
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1answer
126 views

How does this under voltage lockout (UVLO) work?

In my project, I need an under voltage lockout (UVLO) to connect the load electronics to the energy-storage element via a power-gating transistor when the voltage across the supercapacitor exceeds ...
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25 views

Minimal start-up current of a PV inverter

In the datasheet of PV inverters, typically (only) a minimal start-up input voltage is given, e.g. for an SMA Sunny Boy the datasheet indicates 100V/125V. However, why isn't there a minimal start-up ...
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0answers
46 views

Piezo cantilever energy harvester: how to mesure such small power?

I am currently designing a piezo energy harvester and I would like to modify the resonating frequency to maximize the energy recovered(for exemple by changing the center of mass of the cantilever). My ...
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0answers
34 views

Getting most power from low voltage solar powers, each different angle

I have a specific problem. I have 10 small solar panels, each max 5.5V and 100mW power. Each one is at a different angle. I want to get the most power out of it. Cost is not really a problem, but I do ...
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1answer
74 views

Power and Energy Computations in the Frequency Domain

How do you calculate the power and energy of a signal given only the frequency domain form of the signal function? For the purposes of this question, please do not assume that it is possible to find a ...
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2answers
65 views

Why do n-type materials have a smaller conduction energy band?

I looked at "Why does a p-type conduction band have higher energy then n-type conduction band in a p-n junction?" and am still confused. From the image above we can see that the conduction ...
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1answer
48 views

Drawing energy from a 3.7V LiPo battery while simultaneously charging with a solar panel

I have a 200mAh 3.7V (0.7W) LiPo battery that I am looking to use as an energy source for a large model airship. I also have a 7.2V 100mA (0.72W) solar panel that I would like to use as a means of ...
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224 views

How to find the dynamic energy of a processor without using capacitive load?

I have the following question: A cell phone performs very different tasks, including streaming music, streaming video, and reading email. These tasks perform very different computing tasks. Battery ...
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1answer
61 views

What is the average energy loss if a booster connected to power source but without a load?

I have lipo battery 4.2V 3000mAh, booster simulation ti power bench TPS55340QRTERQ1 ‑ 2.8V-4.2V to 8.00V @ 1.5A Vin 2.8V - 4.2V Vout 8v Iout 1.5A simulation details efficiency 84% 1.43Mhz duty 65%...
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130 views

My first full contact-less power meter doubts

I need to measure power consumption of an industrial machine, it is supplied with 3-phase plus neutral connections, 220V per phase. They said there is a voltage stabilizator device between the power ...
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1answer
84 views

Can a machine be powered with food energy? [closed]

Would it be possible, in principle, to create a machine that digests food in a similar way as humans do, extracts energy from the food, and stores it as electrical energy in a battery to power its own ...

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