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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27 views

Line to Line or Line to Neutral connection and corresponding Power Consumption for Airconditioners [closed]

This question pertains to power supply for Air conditioners in India where we have a 230V, 3 Phase distribution system. Are Air conditioners connected using a Line to Neutral connection or a Line to ...
4
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2answers
668 views

Single LED powered directly from AC mains

Today I disassembled a power strip (power extension) and found a LED connected directly to AC with a normal resistor (not a power resistor). How is it working as I thought it would be burned in no ...
2
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1answer
29 views

Power Consumption and efficiency

I know that similar threads had been answered but due to the fact that i am a beginner at electronics i would like to verify my measurements concerning about voltage total current and power ...
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2answers
81 views

Measuring Power Consumption of a Mixed-Voltage Device

TL;DR How can I measure the power consumption of a system that uses power supplies with multiple voltage outputs? Background I need to perform some power consumption tests on a desktop computer. I ...
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2answers
57 views

Piezo transducer current consumption

is there any way how theoretically determine the current consumption of ultrasound piezo transducer? I only know impedance for res freq = 50 ohms and excitation voltage around -170 V. Does the Ohms ...
0
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3answers
140 views

Charge Rate Myth?

Many websites post that charging your device with a high ampere charger will heat up the device and depreciate battery life. Is this really true. I have a sony nex camera that uses 5v 500ma input. Is ...
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1answer
93 views

Constant Current Load ampere measurement

I have the following circuit that I am building, a constant current load): I am using a 9 volt battery and a 1.5 volt battery to power the circuit. My load under test is a AA battery. Based on this ...
4
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5answers
519 views

Handmade timer versus IC

Are there power consumption benefits between a discrete timer: astable multivibrator or some other; and an integrated circuit? I have a time dependent circuit in a project and I went looking for the ...
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3answers
76 views

How can I monitor AC current in multiple wires with a single ammeter?

I'm looking for a cheap way to monitor my electricity consumption across multiple power plugs, on a per-wire basis (ie. I'm not looking for total power consumption across all wires) There are many ...
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1answer
50 views

Charging all night and its effect on the charger

I googled about this topic and I found that keeping the charger plugged in the wall for days will consume a very small amount of energy and will not cost too much. And most of smart phones disconnect ...
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2answers
69 views

3V7 to 5V level conversion

In my product i am using a wifi module requires 3.3v and a bunch of other components requires 5v. For this i am using 3.7v 3000mAh battery. So here i have a doubt whether to use which case or any ...
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3answers
104 views

Why does my resistor consume so much power?

I've created a low battery indicator circuit which lights an LED when the voltage drops below 3.75V. in this circuit, the 62ohm resistor is consuming about 240mW of power. why is this? is there any ...
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3answers
96 views

how do i select a battery for a circuit which has multiple ICs?

I am using INA125 amplifier, a PIC controller, a load cell and a ESP 8266 wifi module. how can I calculate the power consumption to select a battery?Do I just add up the currents of my 4 devices or is ...
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1answer
70 views

Unexpected reversed voltage over shunt resistor

I'm trying to measure the current consumption of an accelerometer using a 1kOhm shunt at Vdd. I've read that there's a ~30kOhm resistor at SA0, so grounding it causes a much higher current draw. When ...
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1answer
146 views

How do “Inverter” or “IGBT” welders control CC and CV output?

I have a question on welding units. A lot of the newer units these days have "Dependable Fairchild or Infineon IGBT (non module)", "MOSFET design for Hobby use" and I can't tell if all of this stuff ...
0
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1answer
49 views

Power for Strip lights

How many watts does a 12v 300 led - 5 meter strip light use roughly, is there a wattage per smd/led there 5050, I have a 5amp 12v = 60watts I think and was told that's more than enough, and I have a ...
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1answer
35 views

Calculating Energy Consumption

What formula can I use to determine the capacity of a USB battery bank (ex. emergency backup battery for a cell phone) to power a device that consumes x miliamps at 5 volts for y hours? I'm ...
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1answer
57 views

Which device has lowest power consumption? [closed]

In one of my project I need to scale down 12V dc to 8V. For this purpose I know that I can use, Voltage divider using two resistors. An opamp with +ve feedback A dc-dc converter I know that I ...
4
votes
1answer
411 views

Can I reduce energy consumption if I disable accelerometer's axes?

I'm using LIS3DH accelerometer, a 3 axes accelerometer to build a low energy consumption device. For now I just need the Y axis. If I disable X and Z, can I save more energy or the accelerometer use ...
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1answer
20 views

Boiler feedpump energy consumption and safety [closed]

Is it advisable to use VFD on a boiler feed pump ?
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2answers
47 views

How does a HT motor deliver profit

How is HT motor more beneficial over a motor of same power delivery. If the power delivered remains same in both types of motor for a given power delivered to shaft, how is one more useful than the ...
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3answers
103 views

Problem with a solar power bank indicator LEDs

I bought a 10000mAh (actual 4000mAh) solar power bank from Victsing few days ago. After having solved a short-circuit problem that affected the solar panel, I noticed that it took an extremely long ...
5
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2answers
534 views

5 year run time on small battery

I am working on a project that checks a sensor every 12 hours and reports the status via cellular modem to our server .. Power consumption is less than 1mA during sleep mode and spikes to 900mA ...
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1answer
68 views

PIC24/PIC16 power consumption during reset

I am working on low power application that has long Vdd rise time. I have external power supervisor that control PIC24/PIC16 MCU reset pin. It holds MCLR pin low during Vdd stabilization period and ...
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1answer
86 views

Calculate power consumption for solar power supply [closed]

I have a project where I need to install 2 IP cameras and 1 radio transmitter in a remote location that will depend on solar power. The cameras and transmitter are 12V, DC and have a combined draw of ...
0
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1answer
153 views

Calculating total power draw of device (camera) and accessories

I work with cinema cameras and at any given point the camera will be adorned with a number of accessories e.g. Monitor, Follow Focus Motors, Cinetape etc which are being powered by ports on the camera ...
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4answers
229 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 ...
-1
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1answer
681 views

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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3answers
4k 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 ...
0
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2answers
271 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 ...
0
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2answers
192 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 ...
2
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3answers
258 views

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 ...
0
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2answers
201 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 ...
2
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1answer
445 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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2answers
109 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 ...
1
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2answers
67 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 ...
0
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1answer
1k 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
384 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 ...
0
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1answer
25 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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2answers
598 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 ...
0
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1answer
266 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 ...
0
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2answers
100 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 ...
0
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1answer
121 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?
0
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2answers
192 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 ...
0
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1answer
2k 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 ...
3
votes
2answers
705 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 ...
3
votes
6answers
2k 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 ...
0
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2answers
156 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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2answers
158 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 ...
2
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0answers
549 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 ...