Questions tagged [power-consumption]

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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Real consumption of SMD5050 Led Strips

I'm building my home lights with an SMD5050 Led strips. And I'm completely lost after comparing specs consumptions with real measured data. So on, I have 5 stripes and 1-to-5 Splitter from my ...
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DDR4 Refresh VPP Power Consumption

My question may seem stupid but for a REFRESH operation on a single-rank DDR4 with multiple DRAM devices, how to properly estimate the DRAM power consumption ? I tried to use Micron Power Calculator ...
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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 ...
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nRF52 GPIO configuration in sleep mode to prevent peripherals from drawing current

I have a battery-powered board with an nRF52832 and some peripherals that I am writing a new firmware for. When set to sleep (NRF_POWER->SYSTEMOFF=1;) the board still draws way too much current (...
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What is the appropriate unit for measuring power consumption by a section of code?

I am wanting to measure the energy consumption of running some intensive blocks of code on Android, but I am very shakey with my electricity knowledge, so I am unsure what measurements I should be ...
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Is microcontroller power consumption directly related to its operation time?

I have to decide on a way to measure the efficiency of an algorithm running on a microcontroller/microprocessor. My thought is that I can use the runtime of the algorithm to complete a certain task ...
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59 views

Why is this device power usage so much power and with such variation?

I just got a wattage meter to try to get a sense of where my electricity usage is going. One of the surprises was my cheap drugstore humidifier, which seems to be drawing 640 watts. I have a huge ...
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43 views

Calculating power consumption of a digital temperature sensor

I want to calculate how much power does the TMP101 (https://media.ncd.io/sites/2/20170721134403/tmp101.pdf) consumes when it's operating. In the datasheet states the quiescent current in 3 cases: ...
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How to calculate check practically POWER of SMPS required for desktop computer

How to calculate check practically POWER of SMPS required for desktop computers I have 10 desktop pc in one PC i have a high end gaming gigabyte motherboard with AMD processor graphic card and ...
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1answer
502 views

Do dead CFL or LED light bulbs consume power and is it safe to leave them mounted?

Do burned-out CFL or LED light bulbs consume power when the switch is on? Is it safer to keep them in their sockets, removed or slightly unscrewed so the bottom center contact isn't touching? I ...
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IC power consumption under 50% vs 100% busload

Is the dynamic power consumption difference significant for a uC, if it has to raise its activity on the chosen bus protocol from, lets say 50% to 100%? I look in overall to the uC+CommController+...
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What consumes the most power in a computer

I have a quite basic question: As far as I understand (correct me if I am wrong), we can summarize a computer by saying it is composed of wiring, transistors and some electronic components like ...
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Calculating power consumption of optocoupler

I am having trouble calculating the power consumption of this optocoupler (4n25). In the datasheet the input power dissipation stated as \$ P_{diss} = 100mW \$ and forward current of \$I_F = 60mA\$. ...
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When to factor duty cycle into power consumption calculations?

This is probably a simple question for most of you. I am calculating the power consumption of a device. The load is driven using a square PWM signal. At what point do I factor in the duty cycle? For ...
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Can we reduce power consumption of digital interfaces by using high impedance transmission lines?

Transmission lines must be terminated with the same impedance as the transmission line has itself to get an impedance matching and avoid reflections at a high impedance end point. This termination ...
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1answer
75 views

Is power balance a relevant factor in the consumption of a house?

Where I live, houses receive up to three phases from the electricity provider. There is a company advertising a power balancing service. They claim that if one of the three phase cables is overloaded,...
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Estimating GPRS power consumption

I'm designing a telemetry station for air quality measurement. Right now, I'm trying to estimate the power consumptions of different hardware configurations, but I'm struggling with the GSM/GPRS ...
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43 views

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 ...
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76 views

Power consumption in voltage detector

I am quite new in embedded system and circuit design. I have designed a system in which I have to add voltage detectors. I need to find the accurate power that the detector can consume in each cycle ...
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110 views

What is the peak current for CR, LIR and AA batteries?

I'm working on a project that requires low energy consumption. In standby mode, it will consume about 11uA. However, when it starts working (it will transmit data in RF), the current goes up to 121mA. ...
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125 views

Why different SOCs have different CPU power voltages for given frequency?

Recently, I studied dvfs tables for 3 SOCs: exynos8890(LITTLE cluster), exynos7880, snapdragon 625. Here is the result: octave source code The point is, that different SOCs with pretty same ...
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2answers
64 views

How much power does a “smart meter” use? [closed]

How much electrical power does a typical domestic “smart meter” use on average, in watts, for its own operation? I have searched the internet for an answer to this question but have been unable to ...
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152 views

Current consumption calculation + Full wave Bridge rectifier

I am facing to calculate the current consumption in a segment of a circuit as shown in the picture below.I have used the formula (showed in the picture) without considering the impedance of the ...
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62 views

AC noise to electronic circuitry

I find some random issues that is still unknown. I'm using mean well SMPS 12v, 3A for supply and charging 2 cell battery 7.4v with a charging current 1.2A. The supplies are parallel which is switched ...
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2answers
53 views

Low DC power consumption: RMS or mean?

I've been measuring low DC-powered devices consumption, by measuring the current at the needed frequency (able to detect the fastest consumption changes). I can then have the mean, max, min. To get ...
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51 views

Will the choice of prescaler and period while configuring a timer influence the MCU load and power consumption?

Let us say we want to configure a 16-bit timer to generate an interrupt every 1 second with a clock running at 8 MHz. We can use several pair of values for the period and prescaler. Let us take the ...
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New consumer unit and MCB calculations [closed]

I am planning on running a new circuit from my current board to a new unit in the loft that I am turning into a mini studio. I am trying to work out what Amp MCBs I would need, however am not sure I ...
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96 views

Measuring power draw of more complex loads such as switching PSU

I'm trying to create an extension cord capable of measuring the power draw of devices connected to it. My approach is using a microcontroller with a non-invasive HWTC current sensor. I am using an ...
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102 views

LM4890 amplifier and CR1616, how to improve power consumption?

I'm a hobbyst trying to design a simple circuit for amplifying the PWM audio output of an ATTINY85. I'm using an LM4890 (1W amp) and a 1W microspeaker. The problem comes when I supply 3V with a small ...
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NodeMCU with JHD162A Lcd module display issue

I have uploaded a program to NodeMCU, to print "hello, world" on JHD162A 16x2 LCD module. But the text doesn't appear on the LCD display. Instead just black blocks appear on the first row on the LCD. ...
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174 views

Powering refrigerator using solar inverter

I have got a 3 kVA (2400 watt) solar hybrid inverter (pure sine wave) which is connected to a 1280 watt PV array and 2 x 12 volt 150 Ah batteries. It is supposed to switch to utility mode if the ...
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Measure low AC Power consumption (oscilloscope? MCU?)

I would like to measure AC power consumption of devices such as AC/DC charger, AC LED bulb or an electric circuit in the main box of a house. However, their power consumption are quite low and the ...
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663 views

How to chose between 9V or 12V (or others) DC power supply [closed]

I see a lot of devices working either with a 9V DC input or a 12V DC input, usually provided through a DC jack connector. I was wondering about advantages and/or inconvenients of both voltages. ...
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273 views

Power Monitoring on nVidia Jetson TX2

I'm performing an analysis of power consumption of CNN ( with the trtexec tool ) on Jetson TX2, varying the Host and Device frequencies. In the past I have performed this power analysis through a ...
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158 views

power consumption of sensors

How to measure the power consumed by a temperature sensor theoretically? The datasheets mention the supply voltage range and output current. So, to calculate the power supply current will be used in ...
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38 views

Does Camera Power Consumption Lower Without Output?

I have a camera with power consumption listed at 24 VDC +10% @ 1.5 A max. That same camera has a built-in output for an external light, 24VDC @ 750 mA max. Without the external light output, will my ...
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49 views

Power consumption for an in-wheel motor

I'm trying to estimate the power consumption of an in-wheel electric motor. I used the formula $$P = T\cdot\omega + K_m\cdot T^2$$ where T is the torque, ω is the motor angular velocity and \$...
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108 views

How is the energy consumption of a ciruit component calculated?

I know that watts are equal to amps times volts, and that watts are a rate of energy consumtion. I have looked at some circuits, but I am unsure of how the total energy use is being distributed. My ...
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4answers
403 views

Does the switching frequency and ON/OFF time duration of LED affect the power consumption of LED?

I want to drive the electronics consisting a controller with different peripherals on its I/O pins, one of which is LED, with 3V coin cell battery supply. I want to determine if its switching ...
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how do LED controllers work

I’m trying to find out if a device only draws the watts it needs to run or if it takes all available For example I have led light that’s says max 0,75 watts and the led controller says output 144 ...
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Relationship between I2C drawn energy / power consumption and data rate

Referring to just what the I2C lines draw, am I wrong thinking that the higher the clock frequency the shorter the time there will be (the same amount of) current flowing through the pullups and thus ...
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Power consumption measurement on the bench

I've been using the Atmel Power Debugger to sort out power consumption issues on some µController based circuits... and have been pretty pleased. Unfortunately, it's limited to a maximum of 5.5 volts ...
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338 views

Battery capacity calculation/method [closed]

While calculating battery power capacity requirement for a circuit consisting of multiple loads having different power consumption, how should one proceed to avoid any error? How it is done in ...
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106 views

Battery Run-time/capacity calculation

Problem is to find the difference in run-time between: a. Using 12V 10Ah battery vs 24V 5Ah battery. PS: Load is rated at 12VDC and 24V to 12V step-down conversion is available.
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348 views

How can I calculate power consumption of the amplifier from its datasheet?

In datasheet of the transistor, CGHV40100, I could not find the power consumption of its. How can I calculate the power consumption? Datasheet of the CGHV40100
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96 views

Doubt with current across several resistors (serie) and Resistor Power Rating

I have read that the current that flows across a circuit of several elements connected in serie is always the same but, as far as I understand, resistors consume current and disipates it in form of ...
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130 views

Needed capacitance calculation

I have a circuit in which I have a Li-Ion 3.6V battery, then a voltage regulator that outputs 3.3V and then the circuit. Also it contains a couple of tiny 1uF decoupling capacitors in front of and in ...
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Exascale Supercomputers Power Consumption

I don't know if its the right place to ask. I have read a lot of articles about exascale and found out that it may consumes approximately 20MW power envelope. Is it a daily basis or a yearly basis or ...
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647 views

Battery Life Calculation, Sleeping and Wake modes

I have a circuit that consumes 1.6μΑ during sleep mode and 40mA during awake mode. The awake period lasts for 3 seconds and the circuit is on awake mode every 30 minutes. The circuit is powered by ...
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650 views

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 ...