Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [power-consumption]

Power consumption is the actual energy demand made on an existing power supply (e.g. battery). Consumption of electric energy is measured in joule (J), but for practicality often watt-hours (Wh) are used.

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How to calculate the time to empty a battery

I am a computer developer, excuse me if the question is basic. If a consumer takes 1600 mA, how long will it take for it to empty a 12 Ah battery? Is it as simple as 12/1.6?
JavaSheriff
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Calculating power consumption in portable air conditioning unit

Apologies for this likely very simple/stupid question. I have a portable AC (air conditioning) unit that's supposed to be "energy efficient". On the back of the unit, it tells me some details about the unit's power consumption: Voltage: 115 V-60…
Jon Warren
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Energy of small E-Paper display modules

Has anyone used small 2"- 4" epaper modules similar to these, and measured the actual energy consumption of them? e.g. in J/erase/write or J per 1/4 rewrite. Have you compared the power crossover point with any low power LCDs? e.g epaper is more…
Henry Crun
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What is the most power hungry component of a air conditioner?

Im taking about those old school air conditioners, which draw around 1200 watts from the wall.
Faraz Ahmed
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Adapter label and electricity consumption

My surveilance cam label states 5==1A. I am not an electrician, but is it right to say that based on tha label, to compute for Power (watts) consumed by the device: 1A x 120 volts = 120 watts For electricity consumption: 120 watts x 24 hours = 2,880…
Kenny Luke
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How to safely increase power consumption on purpose

I have an esp32 nodemcu hooked up to a powerbank. My issue is that the power consumption is so low, that the powerbank thinks there's nothing connected to it and some electronics inside then tell it after a few minutes to stop delivering power to…
Daniel F
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Is electricity wasted when you've connected, say a mobile charger but are not using it?

I know that the answer is yes. It is consumed, but in very little amount. My question is how it consumes electricity. When the phone isn't connected the circuit is open at the phone end of cable, then how does electrons move around the circuit,…
M.Ahmad
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SATA-II Power consumption

I cannot find a concrete specification on the net on how much current can be drawn from an SATA-II connection. I am sure that the standard specifies that value, but I don´t see the point to buy the whole spec just to know this single value. Does…
Junius
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Measuring how much current a tablet style device draws

I wanted to measure how much current a usb-c device (specifically, a reMarkable 2 Tablet, but this could apply to any device) draws when in use, so I bought one of these: I hooked it up and got a value (about 480 mA). But then I started thinking,…
LarryBud
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How does area of transistor affect power consumption

I knwo when you increase the area of a transistor of a circuit, the power consumption will be increased. I just want to know why is that case? Here is my circuit in spice
Mirage
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Meter reading is not equal to the actual consumption calculated from the wattage of the equipments

Today I have the checked the meter. It was showing 0.650 kW (instantaneous power) while just four appliances were running. i.e two ceiling fans of 60 W each and two refrigerators of 150 W and 180 W respectively. Total power consumption 60 + 60 +…
Waseem Khan
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Basic Power Consumption - Continually leave AC on vs Occasional start/stop

Question If my goal is to keep my energy consumption at a minimum should I power my AC off once the room is cool or leave it running in its sort of stand-by state (fan still running)? I'm not sure of the physics of the power consumption but I assume…
Jacksonkr
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How can I know the number of units consumed by each A.C. in a home

The question is fairly simple. I have three air conditioners in my home and the bill for their electricity consumption comes combined as only a single meter is installed. My question is Is there any other way possible to calculate the amount of…
Kartik Chauhan
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Boiler feedpump energy consumption and safety

Is it advisable to use VFD on a boiler feed pump ?
user95289
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Electricity consumption of unscrewed light bulb

I've got 4 light bulbs connected to one switch but I don't need this much light in my room. Plus I'm a bit afraid for my electricity consumption. Would unscrewing 3 of the 4 light bulbs lower it?
Arthur Rey
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