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
54 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
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0answers
39 views

Good DC motor for producing energy [duplicate]

I am trying to design a small electric generation unit. So I have tried 6-10 different DC and AC motors and none of them are great for what i want to do. I need something that has very low torque and ...
0
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2answers
76 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 ...
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1answer
75 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 ...
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0answers
5 views

How much energy does RSA consume if implemented on Arduino or Raspberry Pi? [migrated]

is there any way to know how much energy does RSA consume if implemented on Arduino or Raspberry Pi ?. Thank you.
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0answers
78 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 ...
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4answers
83 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)?
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2answers
56 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 ...
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2answers
44 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 ...
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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
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1answer
44 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
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2answers
159 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
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2answers
97 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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1answer
98 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: ...
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3answers
76 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
24 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
116 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
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2answers
73 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
59 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
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1answer
73 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
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2answers
56 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
105 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 ...
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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
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2answers
123 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.
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2answers
123 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 ...
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2answers
247 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 ...
16
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
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1answer
132 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
115 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?
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2answers
60 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
82 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
112 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
53 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
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1answer
104 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
35 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
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1answer
67 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
186 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
107 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
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1answer
37 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 ...
2
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1answer
88 views

How to measure energy distribution

I want to evaluate the energy flow in a battery powered system. So when the system runs a specific task the energy distribution between the different loads can be obtained ( similar to a Sankey ...
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0answers
142 views

Texas Instruments MSP430F6736, e-meter Energy Library problems with measures

I already posted my question on Texas Instruments' forum e2e.com but I didn't solve my problem. Maybe someone here will have an idea of what's going wrong. I'm using a MSP430F6736 and I have a big ...
0
votes
2answers
304 views

Using a microcontroller+BLE (Bluetooth Low Energy) +Servo with one battery source

I am currently working on a project where I was looking for a microcontroller that is capable of BLE (Bluetooth Low Energy) which determines a servo's position. Using an Arduino the project works well ...
0
votes
2answers
160 views

How could a rechargeable battery charge itself without an external source?

While I was working on my graduation project I had to charge a rechargeable battery then discharge it and so on.I was shocked when the battery charged itself without any other external sources for ...
1
vote
3answers
88 views

Capacitor vs battery which cost less per capacity? [closed]

I know that batteries have better density ie capacity per volume. But I want to get the most energy capacity for the money. Which one would would you get? I'm trying to store energy from solar for 1 ...
3
votes
1answer
140 views

Why are batteries measured in electrical charge unit (ampere-hour) and not in energy unit? [duplicate]

I've searched for an answer for this question for a long time. Specifically I've found this thread which is closely related to my own question: Why are batteries measured in ampere-hours but ...
0
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1answer
32 views

Energy in transients vs. steady state

In something like a regular household, how much energy consumed is transient power vs steady state and what kind of frequency distribution does it have, roughly? I imagine the vast bulk of the energy ...
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votes
1answer
68 views

How can cities save electricity? [closed]

So I read about exercise equipment that produces electricity but very little, is anyone working to improve on it? I feel like this has a lot of potential to fight obesity and save on electricity no ...
1
vote
4answers
270 views

Is it possible to measure energy consumption from power socket? [closed]

I wanted to know if it is possible to measure how much energy is being consumed in the entire house by plugging in a power meter in any power outlet in the house? I am aware of some portable meters ...
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3answers
159 views

Can we use use an oscillator as a low power source?

Is it possible to make an oscillator (or buy an oscillator IC) that can give directly (without using a power amp) up to 2W (or even 1W) of power? And if not, then what stops oscillators from getting ...