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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1answer
53 views

Energy stored in the capacitor increase when the capacitance decrease [on hold]

Help!!!!Energy stored in the capacitor increase when the capacitance decrease.Suggest an explanation for this energy increase, making reference to conservation of energy. Question [paper 3,Q4(D)(ii)] ...
0
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0answers
29 views

How does the Soccket's internal gyroscopic mechanism work?

I came across this heavily funded Kickstarter campaign of Soccket, A power generating soccer ball that is capable of giving 3 hours of power for 30 minutes of play. The inventors claim the usage of a ...
1
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0answers
75 views

How to light an LED using supercapacitor [duplicate]

I would like to light up a 3W LED from Cree having a forward voltage of 2.9 V at 350 mA. It's maximum drive current is 1 A and gives 300 lumens/m2 output. I am considering lighting up this LED using ...
1
vote
1answer
83 views

mAh and Wh ratings not matching with voltage of device

I was under the impression that Wh = Ah * V I have a 20000mAh battery charging device for my phone but am confused about the information provided by it on the side. It claims to have a 5V output (3....
0
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2answers
39 views

Force feedback electromagnetic power requirments

i am design a force feedback system for a gun controller which will use an electromagnetic drive system to replicate gun recoil. Ive explored a range of design but all seems to require allot of power. ...
1
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0answers
70 views

CT (current Transformer protection)

I try to read some value from CT. Everything is alright but sometimes I read some really high value on my arduino pin. I was looking some information about the CT protection. People talked about diode ...
0
votes
2answers
45 views

Can a variable frequency drive be connected to a motor driving a hammer mill to save energy? [closed]

Inductive motors are largely used to drive pumps, hammer mills etc. When used with pumps are there benefits of connecting a Variable Frequency Drive(VFD) to a motor. Does tha same hold true of driving ...
0
votes
1answer
56 views

Measuring Active power through current sensors

i want to measure the AC current - with 220 V AC 50 HZ at home - i will use a current sensor then find the power factor through comparing the signals of the V and I then find the power then i ...
0
votes
0answers
35 views

Energy meter measuring AC power

I am investigating building an energy meter probably using an Arduino and trying to understand the main principle of operation. We have a solar installation on our roof and already have meters for ...
0
votes
2answers
85 views

is one “bigger” psu more efficient than two small?

I'm going to replace my router and network switch, and question is if both devices comes for example with 5v 1a power supply, is it good idea to buy one 5v 2a power supply and connect both devices? I ...
0
votes
3answers
53 views

Gates and energy loss [closed]

i read in a book that when we have for instance a NAND or NOR gate ,the processor doesn't lose energy because we do not have direct current transfer from Vdd to Vss so the processor does not consume ...
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votes
1answer
59 views

How to calculate the energy consumption of a liner sensor array?

I'm trying to determine the energy consumption of a device in kilowatts, but I'm having trouble because the datasheet provided only gives me estimated voltage and not amps. DATASHEET: http://pdf....
1
vote
1answer
92 views

How to calculate energy transfer in inductive heating?

I designed an inductance heater. Its inductor is calculated 50 uH as below: And I draw 9.4 A AC current at 33 Khz of it. But, I want to know how to calculate the transferred energy to the ...
0
votes
2answers
81 views

Transformer drawing 29x more current than it needs

I have an old transformer (20+ yrs) in a building I manage (GE Model 9T23B3872), it takes 277V 3-phase and converts it to 120V 3-phase. It seems very wasteful. It is drawing a combined 8.7 A @ 277 V ...
0
votes
1answer
77 views

Range of Electromagnetic Waves/Radio waves? [closed]

What basically determines that how far the electromagnetic waves will travel away from the source ? In our world where there is air and other materials how electromagnetic waves would generally ...
2
votes
0answers
83 views

Q: What is the power of this signal

Determinate the power of the discrete signal: $$x[n] = u[n] + (-1)^n + (\frac{-1}3) ^n * u[n]$$ where: $$u[n] = \begin{cases} \ 1, & n \ge 0 \\[2ex] 0, & n \lt 0 \end{cases}$$ The answer ...
0
votes
4answers
102 views

Combining of two or more ultra low voltage DC/DC step up converter chip's (LTC3108) output

I want to use one LTC3108 with micro solar panel and other LTC3108 with TEG panel. Can I connect two LTC3108s' output to the one battery charger chip's input (max1555 for example)?
0
votes
2answers
57 views

Energy stored in capacitors connected in series

I am confused with calculating total energy stored in capacitors connected in series. To calculate a energy stored in a single capacitor in terms of joules is ...
0
votes
2answers
48 views

Understand boost converter's voltage conversion ratio

Below is a boost converter with its inductor current waveform operating in DCM. The voltage conversion ratio of the converter is as follows: M(D1,D2) = V/Vg= 1 + D1/D2 where V and Vg are output and ...
6
votes
3answers
2k views

Where does all energy go?

If I apply a voltage V to an inductor's terminals and wait for all transients to cease it will store an energy given by the formula: \$L \frac {i^2}{2}\$ If i remove both terminals rapidly enough to ...
2
votes
1answer
49 views

Ungenerated Voltage across the DMM and random spikes across the Oscilloscope

I am working with piezoelectric material known as PZT-P-43 MY PZT datasheet (please look at the red outlined). So far I have been trying to find the Energy that is being delivered to my 100uF ...
6
votes
2answers
161 views

Maximum power out of thermoelectric generator?

The conventional method to extract maximum amount of energy from ThermoElectric Generator (TEG) is to load it with a resistance equal to the TEG's internal resistance as the maximum power transfer ...
0
votes
2answers
100 views

What does a RF wave carry? [closed]

Other than an AC (Alternating Current) can a RF wave carry anything else ? How can the energy a RF wave carry be measured ? Would the frequency of the wave be related to the transmitted energy of the ...
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votes
1answer
99 views

Help determining power and energy of various signals [closed]

I need a bit of help. My problem is to determine the energy and power of each of the following signals: ...
1
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3answers
83 views

Storage for High Power High Current Pulse

I am currently developing a high voltage, high current amplifier for an EMI test pulse generator. I have been able to generate the pulse in 5V level so far and I am now trying to boost the pulse (in ...
2
votes
1answer
28 views

Wireless Sensor Network Lifetime Estimation

I am attempting to replicate a calculation for estimating the lifetime of a wireless sensor network based on the measured energy draw of each operation. These values are given in a table which I have ...
4
votes
3answers
125 views

repeatedly turning an incandescent light bulb on and off every 20 seconds will cause damage to the bulb?

I have seen similar questions to this one but none of them were asked in the range of seconds only minutes. I just finished building a incubator for chicken eggs and I am using an incandescent light ...
0
votes
2answers
75 views

Replace some LEDs with Diodes [closed]

I have a COTS solar battery charger that has a number of different LEDs identifying the battery level, if its charging, etc. Its going to live in the shed, so 99% of the time no one will see its ...
0
votes
1answer
61 views

How do I work out energy stored in a capacitor bank?

I would like to know how to work out energy stored in a capacitor bank ? I have done my own working outs and have reached an answer of 0.192J, I don't know if this is correct ?
0
votes
1answer
83 views

Measure current of multiple loads with one sensor?

I have been doing some research for my project which requires to measure power consumption of 8 different loads. For that I plan to measure current in each line and multiply that with the voltage of ...
0
votes
2answers
57 views

Battery support capacity for inverter supply of 30A over 3hrs

I need to determine the 12VDC Ah capacity of a battery pack, to provide current to a 30A 120VAC circuit thru an inverter with 88% efficiency, where the voltage must not drop below 10vdc, over a period ...
0
votes
2answers
127 views

Power Consumption on 220VAC vs 120VAC

I have an appliance that consumes 5mA when in standby on 220VAC mains. I'm assuming on a 120VAC 60Hz system it would also consume 5mA in standby (can't measure it). Since I haven't measured it, I ...
20
votes
6answers
2k views

Is a microwave's output power proportional to the mass of its contents?

My friend and I are having a heated debate. On the one hand, he thinks that a microwave oven that is empty, consumes almost no power (not considering lights, lcd, etc). He says that once you put an ...
0
votes
2answers
150 views

How do I calculate the energy (kWh) consumed by my 5V smartphone charger?

I'm having a little trouble in figuring out how much power is absorbed by my 5v smartphone charger. I'm curious as to how to account the energy loss due to stepdown.
1
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2answers
131 views

Checking CS5463 Power Measurement IC

I am using CS5463 for energy metering application. Is there any way to check if IC is working properly without communicating with the IC through SPI interface? I just want to make sure that the ...
-1
votes
2answers
302 views

What's the most economical way to digitally measure 240V mains voltage, current and power factor?

I'm looking to capture and analyse measurements of the mains energy that I use per circuit. I've found a few consumer products that offer powerpoint energy monitoring such as the Kill-A-Watt, but PC ...
17
votes
4answers
2k views

Why is home voltage value higher during the night?

I have been monitoring the voltage in my own home ( Mexico 120v 60Hz ) I have been graphing the values every minute and im starting to notice that during the morning voltage gets up to 127 and during ...
0
votes
1answer
166 views

Measuring Li-Ion Battery voltage during charging/discharging

I am supposed to measure a Li-Ion Battery cell's energy efficiency. For this purpose i have built up the apparatus setup which charges and discharges the battery cell to calculate its energy. One ...
0
votes
1answer
192 views

Energy efficiency of Li-Ion Battery

My question is that does the energy efficiency for Li-Ion battery varies for different C rates ? For e.g if a battery is charged and discharged at a lower C rate, would it's energy efficiency would be ...
2
votes
3answers
75 views

High capacitance electrical capacitors

Are high capacitance electrical capacitors capable of storing energy instead of using a battery. If so would they be able to hold 7 kws of usable energy for domestic home use?
0
votes
2answers
63 views

Calculate power consumption that varies every second

We know that power consumption or Energy is E = Power x Time for utility billing, we used E = kWatt x Hour But I am not ...
0
votes
1answer
83 views

How is Frequency related to Kinetic Energy?

Does producing higher frequency waves require more energy than their low frequency counterparts with same amplitudes? For example, in electronics, would a 500 kHz wave require higher voltage to ...
1
vote
1answer
122 views

using a multiplexer for a high dynamic range current sensing

I am working on a project in which I am supposed to do current measurements for a sensor node. the range of the current varies from 0-30 mA the sensor node has two modes: 1. active mode (maximum ...
0
votes
1answer
61 views

Energy consumption of a small TFT

I am looking to replace a 4.3 inch TFT (480*270 px - 400-500 mA @ 5V) by a more energy efficient one (other sizes welcome) to go with my raspberry pi driven handheld emulation console. What is the ...
1
vote
1answer
107 views

How can enabled WiFi save battery? [closed]

My Lumia 535 claims, that leaving my WiFi connection turned on can save the battery. How can that be true? I'm a layman, if not ignorant to this area of expertise, but from what I was always told ...
0
votes
1answer
37 views

Does ZigBee Smart Energy Profile 2.0 support meter data pushing from meters to a concentrator

I've had a look around but can't find a clear answer. Can ZigBee Smart Energy Profile 2.0 devices send unsolicited messages to a data concentrator without a poll from the concentrator? Like ...
0
votes
1answer
71 views

CS5453 Energy Meter IC

Recently I have come across Energy Meter IC "CS5463". I read the datasheet and it says that the internal registers of the IC stores the Power information as a percentage. My understanding is that I ...
5
votes
3answers
222 views

Highest energy density electrolytic capacitors

I'm building a project that involves discharging a fairly large capacitor through a pair of electromagnetic coils. It's electrically very similar to a coilgun, though for a different application. I ...
0
votes
1answer
108 views

What is the efficiency of electric power converted to heat?

I'm trying to understand how much heat is generated when a given amount of electric power is drawn. And from what I understand, it's pretty much 1 to 1 isn't it? Example: If I have a 1 HP motor ...
0
votes
1answer
42 views

Convert power readings to energy readings

I have some electric power readings collected from a smart meter. With each reading there is energy consumed as shown in figure at link. Some readings do not have energy values. So, I need to ...