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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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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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4answers
635 views

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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1answer
91 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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1answer
55 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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42 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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95 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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2answers
70 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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49 views

Power calculation for given load

Peak Load Normal/Actual load Currently available 300kW 180kW 200 Amperes The system is currently running on 200A connection ...
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2answers
65 views

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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0answers
84 views

Is it possible to find out current consumption of circuit design before giving it for manufacturing?

I want to measure the current consumption of my PCB design before giving it to PCB manufacturing. Is it possible..? If yes than what are the tools..?
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How does the wind farm decides to give priority to reactive current during faults or voltage dips? [duplicate]

The grid code for lvrt system says that during low voltage faults wind farm must give priority to reactive current and supply it to grid and decrease the active current. How does it provide reactive ...
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0answers
55 views

how to switch off ultrasonic sensor when not in use?

I have ultrasonic sensor which is connected directly to the battery, the sensor take data every 10 mins and the battery is not in use for the rest of 9 mins. I want to switch off the power supply to ...
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3answers
62 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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0answers
36 views

Power consumption of RFID vs SD card

I am working on enhancing security of data on electronic passports using homomorphic cryptography. Obstacles I am facing in application of the solution I have came up with relate directly to available ...
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3answers
103 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 ...
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1answer
22 views

variable regulation source

I am learning electronics and I want to make a , variable regulation source for a soldering iron, which works at 50W, how much voltage and amps should have the output? For the soldering iron works ...
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1answer
46 views

BU2505FV current capability

I plan to use the BU2505FV Digital Analogic Converter in my design. After some simulations on LTSpice I've concluded that each of the analog output will consume 700µA maximum. Is this component able ...
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1answer
54 views

What does the 20-80A rating on an energy meter mean?

On the energy meter nameplate is a current rating 20-80A, which I can assume has something to do with max current. I'm particularly interested in the "20" part, though. What does this rating mean? I ...
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71 views

Using 40w tubelight choke to light a 39 w tube

Can I use a 40w tubelight choke to power a 39w 3feet T5 tubelight? Will the excess wattage create any problem such as decreasing the life span or causing the tubelight to burn out?
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1answer
37 views

How to calculate 18650 battery use time?

I am currently powering my mini fan using a normal power bank (the one used for smartphone) which is 5V, 2A output and can last for around 6-7 hours. If I power my fan using two 18650 3.7V 2300mAh (...
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3answers
378 views

Measure the power consumption of a circuit with Arduino

I need to measure the power consumption of a circuit I have built. The components are as follow: Lipo battery 500mAh Accelerometer RTC RedBear Nano 2 Usually I measure the consumption using an ...
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0answers
26 views

Required Power Supply Driver for Peltier Module TEC12715? [duplicate]

I am making a Mini-Air conditioner based on Peltier TEC12715. I'm going to use 10 peltier elements for better cooling. 1 peltier module requires: Umax(V):15.4 Imax(A):15 Max power consumption (watt):...
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213 views

Power consumption of Nucleo L432KC board

I'm currently developing an IoT LoRa node using a Nucleo L432KC. I want the node to be alive more than a year, so I want to test its energy consumption very carefully. I intended to cut off any ...
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0answers
71 views

Energy of small E-Paper display modules

Has anyone used small 2"- 4" epaper modules similar to these, and measured the actual energy consumption of them? e.g. in J/erase/write or J per 1/4 rewrite. Have you compared the power crossover ...
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1answer
49 views

Matrix of WS2812b powered in 24v (LEDs 5 by 5)

In order to reduce the power for a large quantity of WS2812b matrix, I would like to power it directly by 24V, by intuition, chaining in series 5 LEDs (for the power only, the data will be one by one ...
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1answer
41 views

Solar panel selection

I have a project being setup in my garden for an aeroponics system its basic components are: 1. Esp8266 2. Single channel relay board 3. Temperature & humidity sensor 4. 12v 3a - 100psi pump 5. 2 ...
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1answer
227 views

How do I calculate the power consumption when my circuit draws AC and DC current and I only have a cheap DMM? (Joule Thief) [duplicate]

:) So. How do I correctly calculate the power consumption of this circuit? :) I don't have an oscilloscope or an DMM that measures I. My DMM is an Extech EX330, which is quite good for it's price. ...
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0answers
57 views

Experimental calculation of torque constant

I would like to calculate the power consumption of a motor: Pm=(ImNτ2pi)/60 where Pm is the power consumption of the motor (mW), Im the electric current used to drive the motor (amps), N the ...
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1answer
67 views

How to calculate the switching loss of an OR Gate?

This is the datasheet of the OR gate. Current consumption as per the datasheet is 25 uA. (Electrical Characteristics table - Page 4 Input current Icc = 25 uA). I am wondering how power consumption ...
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1answer
175 views

Is it bad to short a DC motor for a long time?

I am using one of those small yellow "robot" DC motor like this one, on a circuit where the motor will turn on a couple of times under certain circumstances. I am thinking of designing a normally-...
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1answer
166 views

Reducing power consumption of an arduino module (mosfet?)

I'm trying to reduce power consumption on an MP3 module controlled by an Arduino. The MP3 module specs are: 3.2-5V (typical 4.2V) <1A peak current, 20mA on standby (which is too much on batteries) ...
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3answers
63 views

Qustion about subthreshold voltage and driving capability

Recently,i read some paper,and some of paper said : To reduce the power consumption of VLSI,Supply voltage has decreased to the subthreshold voltage,and the subthreshold circuits consume a very low ...
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1answer
73 views

Controlling 64 servo with arduino [duplicate]

I want control 64 servo with arduino. I'm planning to use I2C based controller cards for control. I going to use SG90 and PCA9685...
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0answers
44 views

Batteries have spare capacity when unused for minutes after running out? [duplicate]

I tested it with NiZN batteries: After they ran out of power, I measured their voltage. 0.9V. I waited 15 minutes, measured again without charging, and it was at 1.5V. I continued operating a CD ...
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1answer
24 views

Connecting power cable to device without enabled power supply = battery low?

Example: Camera or Discman (XP-EV500) with DC power cable: If I connect the power cable to the device, but the charger is switched off or not connected to the wall, then the camera/discman indicates ...
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1answer
95 views

Battery life calculation using Nano, NRF24L01+ and window magnetic reed switch

I'm trying to make my own home wireless security system. I will be using probably 3 AA batteries to power these devices. My problem is that I need to know if the batteries will be enough to power ...
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1answer
56 views

How can I Calculate a homes average amperage based on kwh?

I'm trying to gauge to what (approx)capacity my panel is being utilized. Is using the number of hours in a month and the power meters kwh during said month, than converting that to amps a semi ...
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0answers
318 views

Ultra low power arduino wireless sensor : care of battery discharge

I'm prototyping a ultra low power wireless sensor. To consume less I run a arduino mini pro at 1.8V at 8MHz with sleep 99% of time. The power comes from a LIR2032 coin and the 1.8V is generated from a ...
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1answer
139 views

How to put a throttle on a vacuum cleaner to reduce power consumption [closed]

I´m no engineer in any way so I don´t know if the question was correctly asked. The thing is I have a 1000w normal household vacuum cleaner that I want to use in my RV(recreation vehicle). The ...
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3answers
4k views

Can I put a resistor in parallel with LED to limit current consumption?

I want to power one 3V LED with a 3V source. Let's say I'm using a 10 Ohm limiting resistor, and the LED eats 20mA of current. Using a CR1225 with 50mAh capacity that will last for about 2.5h. What ...
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6answers
2k views

How do resistors limit current for an LED? [closed]

If I have an LED with Vf = 2.1V and I = 20mA, Ohm's Law says I should have a resistor in series at a value of R = 145Ω, if the voltage supply is Vs = 5V. However, I believe can put a higher valued ...
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1answer
68 views

Power consumption of TDA8029 USIM controller for 3V/5V cards

we are using TDA8029 in one of our application board. Just a summary of the circuit. TDA8029 in our board connects a USIM card and reads the data and sends on UART. In our board, 2 supply inputs of ...
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0answers
310 views

calculating current draw for opamp circuit

I am trying to understand how to estimate the current drawn by the following opamp circuit and how much current the regulators for the +14/-14 rails should be able to deliver. The opamp used is the ...
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2answers
100 views

confused about power rating for washing machine in datasheet

I am interested in purchasing a Primus washing machine but I get confused about the power rating that is recorded in the data sheet (link below). On page 2 of the data sheet, the manufacturer states ...
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1answer
740 views

Does a rated 5V, 2.1/1A charger provide a constant current? [closed]

I use power banks often to charge my iPhone. The default charger is a 5V/1A charger (which I assume provides constant current). However, the power bank has 2 output ports - able to provide 5V=1A and ...
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4answers
508 views

How to compute electric bill for a server netbook

I've taken an old netbook and started using it as a tiny game server. I have removed the screen, wifi card and reproductors, but the rest is there (battery, fan, sata HDD). It runs 24/7 and charger is ...
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1answer
49 views

Power impact in a wireless sensor network architecture

this is not a real question but a way to talk about the following topic. I was thinking on a monitoring system based on a Sensor part, a Computing part and a Radio Transmission part. My question is ...
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1answer
161 views

How to safely increase power consumption on purpose [duplicate]

I have an esp32 nodemcu hooked up to a powerbank. My issue is that the power consumption is so low, that the powerbank thinks there's nothing connected to it and some electronics inside then tell it ...
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1answer
812 views

Is amplifier power consumption relative to signal gain, or output volume?

Is the power consumption of an amplifier proportional to the output volume, or the signal strength increase? In other words, if I turn the amp volume down by half, and then turn the input line level ...