Power consumption is the actual energy demand made on existing power supply (e.g. battery). Consumption of electric energy is measured in watt-hours, Wh.

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HM10 Bluetooth (CC2541) put in to sleep while connected to iOS application

I'm trying to trigger an action on iOS application using HM10 Bluetooth module. And i have successfully accomplished the functionality, But now my concern is the power consumption, I have already ...
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38 views

Industry standard for remote monitoring of solar power generation

I'm a software engineer and I'm working on the code for a small device that will monitor the electrical production of an array of power conditioners (grid-interactive inverters) for a set of solar ...
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2answers
83 views

how to calculate power consumption

I have a Surface Pro 3 and am on the run a lot so I'm thinking about getting a deep cycle AGM battery to put inside my car so I have a constant power. I need to know and confirm some measurements ...
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48 views

Rating 1.5V 50mA (MAX) what does it means?

I have an optic mouse that has in its specifications this: 1.5V -- 50mA (MAX). What does it means? Does it means it consumes 50 miliamps an hour? or the maximum consumption would be 50mA depending on ...
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2answers
88 views

LED lamp increased power consumption after installation: Why? [closed]

I'm new here, but I've been checking your forum few times before, never registered. Anyway... I have a problem at my home. I'm not very electrical kind of guy, so these questions may be easy to answer ...
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Can I increase the no of operating hours of a battery without increasing its capacity?

Setup Let's say I have a 12V / 1Ah rechargeable battery pack. A device that consumes 0.1A will run for 10 hours. When the battery drops to 8V, the voltage will be insufficient and the device won't ...
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2answers
68 views

How can i find total power consumption of the device from its datasheet?

In datasheet which parameter should I consider as a power consumption of a device? What is Icc? what is Iin? To get total power consumed by device can I multiply input current Iin with input voltage ...
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120 views

Do global variables consume more power than local variables in embedded systems?

Today my colleague from work said that access to global variables on microcontrollers consumes more power than access to local variables, unfortunately she did not explain that. At the beginning, ...
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78 views

switch OpAmp down to minimize power consumption

I'm currently designing a board which senses some stuff. The board is powered using a 6V lithium battery. According to my sensor+OpAmp logic I need to split the voltage into +/-3V. The circuitry to ...
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2answers
52 views

Do chargers use power when they're not charging? [duplicate]

1) If I connect my mobile charger to a wall socket and it is switched on, but I don't connect my mobile to the charger, does the charger still use electricity? 2) If I connect an extension box to a ...
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1answer
275 views

Piezo buzzer current consumption

In my DIY project I need to decide do I want to use piezo buzzer (for sonar-like device) or not. To decide this I need to calculate current consumption of this device. Parameters I was able to find in ...
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2answers
82 views

Are BLE modules capable of working with a CR2032 battery? [duplicate]

I keep reading that the Bluetooth Low Energy modules are capable of working with a CR2032 battery for years, but their consumption is around 20mA and the max discharge of a CR2032 is around 3mA (200uA ...
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1answer
23 views

What's the difference between logic/if system and drive system of a display?

I've been looking at the current consumption of a display and the datasheet says the following: Can anyone tell me the difference between "drive system" and "logic/if system"?
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86 views

led light strips power consuption

I got one of these 5050 600 led light strips , according to the numbers it uses 12v at and 95 watts per 5 meters, that’s equal to 7.91 Amps, and they sent me a HUGE 10A power supply, everything seems ...
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1answer
107 views

LMH6611 (OpAmp) draws too much current

We are using the LMH6611 OpAmp from TI as it offers high current rail-to-rail output (100mA) and high frequency (345MHz), which seems to be quite unique in this combination. In addition, the power ...
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1answer
57 views

how does ohms law apply in power system

It appears that either all the people over the internet have either not thought about this question or that I am mistaken in my thought somewhere: Confusion appears when I try to apply ohms law to ...
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1answer
112 views

Electricity consumption of unscrewed light bulb [closed]

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?
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118 views

How much power does a GPU actually use when only doing PCIe I/O, or only compute?

I hope this is the right sight to ask such a question, if not please be kind and direct me elsewhere. I have some discrete GPU with a TDP figure of X watts. Now, sometimes the GPU does Only ...
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1answer
667 views

How much power does a wireless mouse use? [closed]

I have seen many answers online to how much power the USB dongle linked to a wireless mouse uses, but nothing about how much power the actual mouse draws from its batteries. What is a ball-park ...
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2answers
183 views

On Computing Power Consumption for a GSM system

I'm a software student trying to learn about embedded systems. I would like to build a low-power system that can send his coordinates by SMS and also receive SMS. Unfortunately I'm at level zero in ...
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4answers
735 views

Calculating discharge time of 12V LED light powered by AA batteries

I just want to check up my assumption on power consumption of six 12V LED lights in parallel connection. So I powered it by 8 AA (E91 energizer) batteries in series. The LED's ideal forward current ...
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2answers
83 views

How long will it take to completely run out of power a Li-ion battery of 3.7V and 1000mAh, if the load consumes 16mA?

I'm trying to determine the exact time that run out power a Li-ion battery of 3.7V and 1000mAh. I'm using a load of 16mA. If I use the theoretical calculus: $$time=\frac{1000mAh}{16mA} = 62.5 ...
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107 views

Do parabolic reflectors in globes increase the brightness of the filament's light, or just 'spread' the light?

If you compare a traditional 60W incandescent globe with the same filament specification as one with with a parabolic reflector built into the globe, does the (usually) aluminium reflector actually ...
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216 views

Bluetooth low energy: effect of slave latency on power consumption

Slave latency is meant to allow a bluetooth le slave to skip a certain number of connection intervals before actually establishing a connection event with the master. In principal, this seems like it ...
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2answers
210 views

Microcontroller on-chip flash consumption - size matters?

For a given MCU, all other things being equal, does the memory capacity impact the power consumption ? A 512kB flash memory would consume more than a 128kB ?
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1k views

What is the meaning of 1.5 ton in air conditioner specifications? [closed]

I'm interested in calculating amount of power consumed in an hour. Does 1.5 ton means 1500kWh?
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4answers
505 views

Calculating Solar Requirements for a Refrigerator

I am attempting to run a refrigerator on solar power, it's "Energy Guide" says 410 kWh/year, so I assumed that it uses 46 W each hour (410 kWh / number of hours per year = 410 kWh / 8760 = 46 W), I ...
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1answer
90 views

How to lower current consumption in JN5148-J01 Microcontroller?

I am using JenNet-IP stack and JN5148-J01 MCU for smart home application. As per JenNet-IP stack my MCU will not be in sleep mode because it is working as router in WPAN. But I have to reduce current ...
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3answers
5k views

How to calculate power consumed by an electrical device in a specified amount of time?

Say for example I have a TV with "140 watts" marked on it. Does this mean the TV consumes 140W per minute? Per hour? Per day? How is the power consumed by device calculated from the device ...
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1answer
133 views

calculating power costs on a 45 and 15 KVA dry type distribution transformers due to no load losses

I would appreciate if someone with expertise could confirm or correct my calculations. 45 KVA 600/120/208 volt dry type distribution transformer 97.7% efficient (therefore losses are 2.3%) .023x45 = ...
3
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3answers
303 views

How to achieve Better power consumption (operation of automatic chicken coop door)

Newbie to electronics and am looking for help with a project I'm working on. I have a 12 v light detecting relay module which I'm using to drive a 12v motor in h bridge relay figuration, taking the + ...
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1answer
383 views

Do unused outlets consume electricity? [closed]

My understanding is that unused outlets do not consume electricity, but I came across a company which sells outlet covers saying: Saves energy by helping reduce drafts through vacant receptacle ...
2
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1answer
743 views

How do you measure apparent power consumption of a transformer (primary coil) with no load on secondary?

Lets say 120 Volts at 60 Hz with a Transformer across it with 1 Henry as the primary and 1 Henry on the secondary. The secondary has no load and is an open circuit. How would I physically measure the ...
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1answer
465 views

How to connect a power supply on the battery socket of a laptop?

I am doing some long-term measurements of power consumption on a laptop. Down below I show a photo of the battery connection pins. I am trying to trick the laptop into thinking that runs on the ...
3
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2answers
722 views

Can power theft on a large scale be stopped

Reading this article, I started wondering if there is any way to stop people stealing electricity from a power grid. Let me clarify, the only techniques I have seen (and can think of) is either to ...
5
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2answers
562 views

If I plug in a USB wall adapter but don't have a device hooked up, will it use power?

So let's say I have a phone and a USB Wall Adapter. If it is plugged up, but I don't have my phone hooked up, will it use power? And if so, will it be a noticeable amount when left plugged in for ...
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3answers
8k views

Interpreting the power rating of the refrigerator [closed]

My refrigerator is rated as 130W of power. I need to know how to interpret this. Does that mean if the compressor works for a whole hour then only it consumes 130W? Or is 130W the average power ...
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1answer
97 views

what is the best solution to high electrical bill [closed]

My friends and colleagues are always complaining to me now, the more wages grow, the higher prices rise, particularly electricity high unacceptably, when sitting at home, nothing to do, just leave the ...
5
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3answers
165 views

Performance analysis of embedded firmware

I'm working on a project where I want to make the software the most power efficient it can be on the system. What ways can I do performance analysis of my system? I'd like to run the system off AAA ...
2
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2answers
136 views

Can I make power consumption analysis much harder by temporarily disconnecting the power supply?

I am thinking about building a dongle that acts as a USB or PS/2 keyboard device and is capable of doing some cryptographic things for me, e.g. provide time-based authentication codes, store passwords ...
1
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1answer
132 views

Power analysis of a simple circuit and battery lifetimes

I only do electronics stuff as a hobby so forgive my simple question. I have a simple IR LED/photodiode detector circuit hooked up to an arduino microcontroller. It's not important but the purpose is ...
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1answer
163 views

How can I reduce the power consumed with wall warts?

I have been designing a project that requires a 5V for some components and 12V for others. I am planning to leave this plugged in 24/7 so I want it pretty efficient. I know they don't waste that much ...
3
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3answers
2k views

What is typical power consumption of FPGA devices

I am new to this site and had one question. I know typical CPUs have power consumption (TDP) in range of 100-200W, for example Intel Core2. I wanted to know what is typical power consumption of FPGAs. ...
5
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2answers
728 views

Relation between power consumed and MCPS (million cycles per second) consumed on a processor

I have been working on a ARM cortex A8 board on MP3 decoder. While doing this I have a requirement saying the MP3 decoder solution I am doing should consume 50 mW. This generated few questions in my ...