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2answers
45 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 6 AA (E91 energizer) batteries. The LED's ideal forward current is 80 mA ...
0
votes
2answers
63 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 ...
1
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2answers
56 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 ...
1
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0answers
39 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 ...
3
votes
2answers
173 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 ?
-2
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1answer
81 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?
0
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3answers
104 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 ...
0
votes
1answer
49 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 ...
2
votes
3answers
603 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
88 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
233 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
224 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
277 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 ...
1
vote
1answer
293 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
417 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
220 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
3k 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
88 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
160 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
134 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
117 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
140 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
1k 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
662 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 ...