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Questions tagged [energy]

Energy is defined as the amount of work that can be performed by a force, measured in joules (J). Energy is power integrated over time; power (W) is energy per second (J/s). This is a poor tag to use. Please consider if your question relates to energy as defined in physics; don't use it as a synonym for power or capacity.

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Lithium polymer battery size versus energy density

I am building a small device that needs to use a rechargeable lithium polymer battery. The dimensions I am looking for are 351125 { 35 mm (H) x 11 mm (W) x 25 mm (L) }, which is the standard way these ...
Sreenivasa Chary's user avatar
1 vote
1 answer
66 views

Most energy efficient way to make a LED blink using a multivibrator [duplicate]

I'm using this LED. I want to make this LED blink at MAX brightness (100 mA) at 1 Hz. I need to use a multivibrator and therefore can't use any IC chips. The circuit is powered by a 3.7V battery with ...
Simon Mayr's user avatar
0 votes
1 answer
118 views

Time average stored electric energy in a volume

I am studying the book Microwave Engineering Third Edition by David M. Pozar. At the moment I am at chapter 1.6. At the beginning of this chapter Pozar states that In the sinusoidal steady-state case,...
CircuitMan's user avatar
0 votes
1 answer
70 views

Average energy efficiency is very high

I am computing the energy efficiency of a wireless system, given by the ratio of how many bits are received over how many energy is consumed. $$EE=\dfrac{bits}{joules}$$ For a given scenario, I have ...
zdm's user avatar
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3 answers
70 views

What makes it hard to lower energy and power consumption for a computation: looking for serious but pedagogical reference

I would like to get "general" culture about what limits engineers in reducing the power and energy consumption to compute. Please correct me if I am wrong but for power, I know that there ...
StarBucK's user avatar
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1 vote
0 answers
86 views

Whats the meaning of Im, Is and Ih

I would like to know what's the meaning for the abbreviations of Im, Is and Ih in leakage currents measurements, as it is depicted in these graphis. Could anyone help me?. The link of the source is: ...
Daniel Prieto López's user avatar
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0 answers
38 views

Why does the valve symbol have a Clase symbol,or short-circyit symbol before the earth [duplicate]

Could anyone explain to me why the valve symbol have a shortcircuit symbol or termination symbol before the earth???
Daniel Prieto López's user avatar
2 votes
1 answer
98 views

Meaning of this power system line diagram symbol

Please explain to me what this symbol means, in single line diagram? Source of image: My project diagram. Here is another example I found: Here is a magnified part, showing the symbol: Source of ...
Daniel Prieto López's user avatar
1 vote
0 answers
77 views

How can I store a energy from a low output?

I need a simple answer to a simple question: How can I store energy as in a battery to use it as energy for an LED lamp or something else? The available power is 50mV- 60mV and 70mA - 80mA.
Eliseo's user avatar
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1 vote
1 answer
66 views

Potential energy of a uniformly charged parallel plate capacitor filled with dielectric

For a uniformly charged parallel plate capacitor (dimensions l × w × d), its potential energy is given by: $$ U = \frac{Q^2}{2C}\ $$ Now if we insert a material (dimension x × w × d) of dielectric ...
Govind Prajapat's user avatar
1 vote
2 answers
79 views

Energy density vs voltage battery

I find on this website the following sentence: It is said that higher voltage battery have higher energy density. But it appears to me not so evident: If I consider the 2 following batteries: If I ...
Jess's user avatar
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1 vote
1 answer
159 views

CMOS (Energy Supply of voltage) [closed]

Can someone please explain why, when \$ln\$ is transitioning from low to high, the energy supplied is \$C_{vdd}\cdot V_{dd}^2\$?
Timothy Garott's user avatar
5 votes
4 answers
2k views

Could a very high voltage and very low current allow a non-superconducting magnetic energy storage system?

A very low current with very high voltage can travel through high resistant wires without much loss. Could this type of current be used on magnetic energy storage without superconducting materials? ...
Fulano's user avatar
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4 answers
60 views

Does reciprocity apply in appliances power consumption?

Normally, microwave ovens have a timer and a power selector. Similarly in other machines, you can control the power and the time you use that power. Is it generally true in real life that the final ...
terauser's user avatar
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0 answers
48 views

Calibration of the Atmel M90E32AS Energy Metering IC

I'm working on an energy metering project featuring the Atmel M90E32AS, connected with an ESP32-S3. From the Application Notes of the IC, I understand that it needs to be calibrated first. However, I'...
Fareed Ahmad's user avatar
0 votes
1 answer
67 views

Parts of a power cable

This is a snippet of 6kV/Single core/240 sqmm copper cable. The parts of the cable are as follows. Stranded Copper Semiconducting Cross-linked compound XLPE Semiconducting Cross-linked compound ...
Nikhil Kashyap's user avatar
2 votes
2 answers
263 views

How to compute the energy efficiency in bits/s/watt

The energy efficiency (EE) in wireless communications is usually calculated as the ratio of data rate to power consumption: how many data (in bits per second) are delivered per consumed power (in ...
zdm's user avatar
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0 answers
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Does minimizing stages necessarily give best outcome when designing circuit under a delay constraint?

In the context of digital design, a common situation is to have to design a circuit for minimum energy under a delay constraint. Suppose a given circuit can be implemented with various stages. Is it ...
EE18's user avatar
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0 votes
1 answer
91 views

Energy reservoir capacitor

How to calculate the appriopriate capacitance for an energy reservoir capacitor that would serve as an alternative IC power supply in case of main power supply failure. Is there a specific formula or ...
Bananabread's user avatar
1 vote
1 answer
137 views

Need to understand the current sensor connection in this circuit

I'm working on creating a smart power meter for my home, and I found this tutorial. I want to understand each part of the circuit, and the tutorial covers everything. However, it doesn't explain why ...
M-125's user avatar
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1 vote
1 answer
69 views

Electric potential - 2 power supplies

I'm studying among other things electrical engineering and I'm kind of in a discussion with a colleague about an 'experiment': he claims that when i measure the voltage between the + output of power ...
olympus_mons's user avatar
0 votes
1 answer
67 views

Mosfet Switching Energy

How can I calculate the energy required to switch a Mosfet knowing the peak power, and the drain to source capacitance?
Mr. Blue's user avatar
1 vote
2 answers
124 views

Why doesn't the cross section of a material affect flux density?

I am trying to design an inductor. I have free hand of using any geometric form and ferromagnetic material. It's my first time doing it. I studied magnetics design in college and I always thought that ...
i33SoDA's user avatar
  • 91
0 votes
1 answer
62 views

Time bounds for power and energy in RL and RC circuits (natural response)

I am curious about how the time bounds in power (t>=0+) and energy (t>=0) are developed in the natural response of RL and RC circuits. For the RL circuit, the natural response of the current is $...
shinyleaf's user avatar
-1 votes
1 answer
50 views

Are the signals differential?

I want to use this IC for a metering purpose. Are the signals IxP/IxN & VxP/VxN differential signals?
Timerace's user avatar
1 vote
2 answers
432 views

Energy in capacitor paradox

Recently I have been thinking about a circuits problem that caused me a lot of confusion. First of all we know from thermodynamics that energy is conserved. I wanted to show a problem that seemed to ...
Mora's user avatar
  • 179
1 vote
0 answers
30 views

Understanding Energy consumption - 3-phase Power Meter - Active (forward, reverse) and Apparent [duplicate]

I'm looking at 3-phase power data from a machine using a Fluke monitor. I've got 'Energy Analyze Plus' software which then calculates lots of interesting things and I'm trying to understand what I ...
CStanfed's user avatar
2 votes
1 answer
254 views

Designing boost converter for a supercapacitor source and LED load

I have a 2.7 V 100 F supercap, that would equal 364.50 J of energy based on E = 1/2CV^2. If my load is a series of 4 LEDs with a stack forward voltage of 12 V and forward current of 3 A that would ...
roaibrain's user avatar
  • 407
0 votes
1 answer
43 views

Relationship between RMS-current and energy stored in a solenoid

Regarding the formula for energy stored in the magnetic field of a solenoid (U=1/2LI^2), I presume that the RMS value for an alternating current could be used for the I-value. Is this correct?
proton's user avatar
  • 1
9 votes
11 answers
4k views

How do you understand the kWh that the power company charges you for?

I really didn't know how to phrase this question. But here are the details. First I understand the simple 10 x 100 W for 1 hour is 1 kWh. But what I want to know is at what time interval does the ...
Mark Twombley's user avatar
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0 answers
38 views

What is the technical parameter details of Genus Bidirectional microcontroller based ABT Energy meter ( 3Ph 4 wire)? Please someone help me out

I am unable to figure out the different parameters of Genus Bidirectional ABT Energy meter. I am working for the installation of SEM meters for the feeders in substation. I know about the energy ...
Camila's voice's user avatar
13 votes
5 answers
4k views

Why do capacitors have less energy density than batteries?

The basic operating principle of a battery is, in order to charge it, the electrons are removed from cathode and moved to anode by applying voltage. And to discharge, the electrons move from cathode ...
Hari Kumar's user avatar
1 vote
1 answer
64 views

Boost Converter - Coil energy transfer into Capacitor - Help needed!

I am trying to design my own boost converter and so am learning about coils. Let’s consider this example: The switch of our boost converter has just opened, there was 100 mA flowing though the coil, ...
Kuba0040's user avatar
6 votes
2 answers
418 views

"To Gap, or Not to Gap" Inductor/XFMR - Energy POV

This post/question is coming from a question I asked within the comments section of here: How to calculate air gap in flyback transformer? The great answer given talks about his solution to the ...
RogerDodger's user avatar
0 votes
1 answer
103 views

The two capacitors are in series but positive end of one plate is connected to positive end of the other

Like the title says, my task is to find the initial voltage across the terminals. The two capacitors are in Series with positive end of one plate connected to that of another. The given information ...
RK Eshat's user avatar
  • 143
0 votes
1 answer
96 views

Find suitable charging voltage for capacitor based on energy and time required for discharging

We need to calculate the charging voltage required to dissipate a certain amount of energy via R-Load. The problem will be as follows: If we need to dissipate 400 J through the R-Load in a time period ...
TomAndreson's user avatar
0 votes
1 answer
94 views

Exceeding max RPM of wind turbine [closed]

I have a wind turbine that reaches its max output power at 1000 RPM, and I want to know if there's any problem if I make it go faster than that (e.g. around 1250 RPM). I have a TESUP Yuzo. You can ...
Wave Rocker's user avatar
1 vote
2 answers
85 views

How much transmission power increase is added by an undriven element identical to a simple dipole antenna 1/4 wavelength away?

These wonderful old videos helped me understand how antennas work. https://m.youtube.com/watch?v=md7GjQQ2YA0 The explanation for making antenna transmission unidirectional relies on using an undriven ...
aquagremlin's user avatar
0 votes
1 answer
582 views

DALI protocol - D4i. How to access to memory bank DTR0, DTR1 at byte level using C code?

I'm currently stuck using DALI protocol with D4i drivers. I want to access the memory bank of one driver and read the energy parameters. I know the opcode to read memory locations is 0xC5, since the ...
Álvaro López Albalat's user avatar
0 votes
1 answer
159 views

ADE7953 voltage input

I am currently designing a power measuring board that incorporates ADE7953 and ESP-32 microcontroller, however although i have read the Datasheet document for ADE7953 and searched online forums I am ...
BulBul's user avatar
  • 103
1 vote
1 answer
44 views

Energy consumption after removing a part from a PCB

Does removing the buzzer chip from a PCB reduce the energy the PCB uses? Is it save to remove the buzzer? It's an FMQ.
Tobias Bättig's user avatar
4 votes
3 answers
1k views

Understanding the flux linkage in transformers

I am having difficulty understanding the concept of flux linkage in transformers, particularly how the secondary winding receives its flux when all the flux is said to be confined to the iron core. I ...
Adhithya S's user avatar
1 vote
3 answers
1k views

Best way to calculate Energy used in a circuit

I'm trying to figure out how to calculate energy consumed through my circuit. I can read the current and see the voltage, can obviously calculate the instant power, but I'm fairly certain that I don't ...
Jedi Engineer's user avatar
0 votes
0 answers
30 views

Estimate transient power of crowbar circuit

I am designing a crowbar circuit and for this circuit it is important that the maximal transient energy that goes through the circuit before the fuse trips stays below a certain limit. The setup of ...
luukito's user avatar
  • 33
0 votes
0 answers
97 views

Getting Energy values from the Allegro ACS37800

I am currently using the Allegro ACS37800 IC to monitor power, from what I found on the datasheets and from the internet this IC is capable of calculating the voltage, current, and power. I actually ...
alasa995's user avatar
1 vote
1 answer
184 views

Construction of a Lagrangian function for a circuit

I was reading the paper "Introduction to quantum electromagnetic circuits", by U. Vool and M. Devoret and I am stuck in the construction of a Lagrangian function for the example LC circuit ...
axis's user avatar
  • 11
0 votes
1 answer
249 views

What types of power rail are there in an integrated circuit?

I understand that power rails provide the energy required for a circuit to function. Intuition tells me there must be at least two types of rail, one providing power and another taking it away. But I ...
Connor's user avatar
  • 399
3 votes
4 answers
3k views

Power consumption based on voltage and current

I'm a little confused of which value of the voltage to consider for calculating the power consumption. Here is the scenario of my voltage and current drawn over a period of time. Vmax = 100 V ...
Ullagaddi's user avatar
0 votes
2 answers
135 views

How can energy be stored in a magnetic field?

A magnetic field can be thought of a vector field of force on electrons. Basically this can be thought of a some area that attracts or repels electrons. It is said that inductors are able to "...
Leftover Salad's user avatar
2 votes
2 answers
93 views

Power and energy of pumped hydro versus grid scale batteries

A company is proposing a pumped hydro system where they state on their website as “capable of producing up to 335 MW of electricity with around 8 hours storage”. The same company is proposing a ...
CLC inquiry 's user avatar

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