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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RMS current measurements using Arduino uno [closed]
I'm working on an energy monitor using Arduino uno board. I'm using the open energy monitor library to measure RMS current. The current is measured using a CT. While observing the current measured by ...
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RF power transmission control in U-blox GSM modules
I am using the SARA-U270 GSM module and want to test energy-saving techniques. One technique I would like to try is power transmission control, adjusting the transmission power in dBm based on the ...
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Energy stored in a saturating inductor
We all know that the energy stored in an ideal inductor is \$E=\frac{1}{2}LI^2\$. However, real inductors with a ferromagnetic core don't have constant inductance. Particularly, when a specific field ...
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Connecting an energy meter with 6 CTs? [closed]
I want to install an energy meter to monitor the energy consumption of a transformer. The secondary side of this transformer is a parallel circuit, making it impossible to connect three current ...
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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 ...
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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 ...
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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,...
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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 ...
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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 ...
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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: ...
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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???
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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 ...
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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.
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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 ...
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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 ...
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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\$?
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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?
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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 ...
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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'...
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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
...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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Mosfet Switching Energy
How can I calculate the energy required to switch a Mosfet knowing the peak power, and the drain to source capacitance?
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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 ...
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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 $...
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Are the signals differential?
I want to use this IC for a metering purpose.
Are the signals IxP/IxN & VxP/VxN differential signals?
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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 ...
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