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2
votes
3answers
152 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 ...
1
vote
1answer
56 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
votes
3answers
197 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 + ...
1
vote
1answer
184 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 ...
1
vote
1answer
147 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 ...
0
votes
1answer
157 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
votes
2answers
309 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 ...
4
votes
2answers
132 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 ...
-1
votes
3answers
965 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 ...
-7
votes
1answer
84 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
votes
3answers
156 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
votes
2answers
126 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
vote
1answer
112 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 ...
0
votes
1answer
123 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
votes
3answers
929 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
votes
2answers
631 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 ...