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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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16 views

Integrated circuit for phase power measurement of PWM driven motor [on hold]

I'm trying to find an integrated circuit to measure power on at least one phase of a PWM driven syncronous or asyncronous motor. I've found plenty of chips that do this kind of job for 50-60Hz ...
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4answers
635 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 ...
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2answers
47 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 ...
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0answers
23 views

Generator RPM and Energy Relation

If a 3 phase AC generator rated 5 kW @300 RPM generates 5 kWh in one hour of continuous operation, is it possible to find how many rotations of the generator at 300 RPM will generate 10 Wh? Thanks in ...
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1answer
28 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?
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0answers
36 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 ...
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1answer
132 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 ...
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0answers
22 views

Battery capacity for optimal life

I am planning to construct a small electromobile for which I will use a 3kW electric motor which will be powered by li-ion batteries. It would be sufficient for the vehicle to run for about 1 hour ...
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1answer
67 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 ...
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1answer
135 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: ...
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2answers
65 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 ...
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2answers
166 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 ...
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0answers
57 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'...
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1answer
57 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 ...
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2answers
144 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 ...
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1answer
38 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 ...
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2answers
75 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 ...
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1answer
90 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 ...
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0answers
44 views

Calculate energy consumption of a servo system whose current changes signs

Basically, I am using a AC servo motor to rotate a payload. As shown in the below figure, the servo motor accelerates the payload from 0 to 1 second and then decelerate it from 1 to 2 seconds. The ...
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1answer
66 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
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1answer
77 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 ...
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4answers
103 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?
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2answers
32 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 ...
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0answers
45 views

Electronic load battery testing - Honda NiMH batteries - Energy storage

I recently found a way to recondition used cylindrical NiMH batteries pretty well (typically those used in the Honda Insight series). However, I want to know whether the batteries will hold ...
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1answer
484 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
164 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 ...
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1answer
54 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 ...
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1answer
58 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 ...
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0answers
76 views

STPM33 UART read/write

I'm working on project, using the energy sensor STPM33 in order to measure energy consumption. I can't understand how to read the register values, documentation seems unclear. There's a similar ...
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votes
1answer
66 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 ...
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0answers
84 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
108 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 ...
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2answers
639 views

What is the power / energy of a discrete time constant signal?

I know that this is a very fundamental (and maybe vague) question. But I'm not sure what period I should use. I read somewhere that a constant signal doesn't have a fundamental period but is periodic....
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1answer
44 views

Energy in a wave

The energy of a wave is defined as w=a^2. w=energy a=amplitude. Does this formula also apply to AC or rectified AC? When two waves with identical polarization, frequency, phase and amplitude ...
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2answers
74 views

When a utility company uses the term “installed capacity” does it mean energy or power?

This is directly from this website: "The current installed capacity on Ontario’s transmission grid is more than 36,800 MW". Does it mean total energy generated & transmitted in a year OR the grid'...
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1answer
116 views

How to process energy (kWh) meter reading data of half-hour interval

If I am to process time series of energy data (point estimate every half-hour interval), and fit it into the following formula for dimension reduction: Haben's paper I was advised to use power, not ...
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3answers
88 views

Small Electric motor to turn generator to turn electric motor to turn generator chain [closed]

This might be a silly question but is it at all possible to use a small electric motor with a small battery to turn a small generator then connect the generator to a slightly larger electric motor to ...
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2answers
43 views

How to know / test a supercapacitors really store the energy [duplicate]

If i charge a supercapacitor, how do i know or test this supercapacitors that it really store the energy (like a battery) and doesn't discharge ? Can anyone give some reference or method? Can i use ...
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2answers
84 views

Energies carried by electric and magnetic fields in plane waves

This is a newbie question. I'm trying to understand what I think must be a very basic concept with an obvious answer, but I want to be sure. Do plane wave electric and magnetic fields of equal ...
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2answers
509 views

How to calculate the energy output (in Joules) from an LED

I need to emit 20J over 5ms onto a target area of 962mm^2 from an LED source. The source as well as the target will reside in a completely encapsulated environment with reflective internal walls such ...
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0answers
132 views

DC energy meter 1000V with RS485 and Arduino getting voltage and current from register issue

I am doing 1000V DC meter with Arduino and RS485. The problem is that when I am sending register value from Arduino I am not getting the output as I want, the output is in hexadecimal, and I can't ...
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votes
1answer
55 views

Energy usage: CPU vs Screen vs Network [closed]

In a modern computer such as a smartphone, what is the relative energy used by the CPU vs the screen (and controller) and network? Clearly the answer to this question is (in so many ways) "it depends" ...
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1answer
1k views

Power supply architecture for energy metering IC (HLW8012)

HLW8012 datasheet (mostly Chinese) Website with english info I am developing a product which requires energy measurement of two different phases. I am planning to use HLW8012 energy metering IC ...
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1answer
45 views

Delivered energy of a RLC circuit - proof

I have an RLC circuit with two resistances \$R \$ and \$R_i \$ in serie. On my book there is the expression of the stored energy (\$C \$ capacitance, \$E \$ voltage on the capacitor): $$W_s = \frac{1}...
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1answer
48 views

What is the energy consumption of incandescent bulb as compared to LEDs and CFL bulbs? [closed]

I read this on website "The electricity used over the lifetime of a single incandescent bulb costs 5 to 10 times the original purchase price of the bulb itself" What does it mean? if the bulb is of ...
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3answers
105 views

Relationship between volts and Mechanical Energy

I am studying Electrical Engineering and I came across one definition of the volt being defined as follows: V = J / C Where "V" is voltage measured in "volts", "J" is energy measured in "joules" and ...
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1answer
49 views

Energy loss and power over one period?

Let's say we have a ferrite core inductor connected to an AC sinusoidal source with period \$T\$. Thus, we have voltage \$u(t)\$ across the inductor and current \$i(t)\$ through the inductor. How can ...
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1answer
62 views

The total energy stored in a multi cell battery [closed]

is the same for series, parallel, or series-parallel interconnections.please Explain this with an example.
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2answers
258 views

reactive power and battery drain(in inverter)

if the load of an inverter(using a battery) is a pure reactive load, will the battery be drained ( neglect the efficiency of DC/AC conversion)?
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0answers
406 views

Tesla radiant energy receiver

I'm trying to build the classic-ish radiant energy receiver (as depicted in the picture). I've searched extensively, but everyone just seems to make the circuit with random C values and wire antenna. ...