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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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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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17 views

CCTV Camera power consumption [duplicate]

I have 3 cameras each rated 12V, 200mA. Please i had like to know if i can powered all the 3 cameras with a single 1Amps or 2Amps 12V power adaptor.
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2answers
72 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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34 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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18 views

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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37 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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0answers
51 views

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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1answer
60 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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116 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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1answer
63 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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1answer
34 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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1answer
42 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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1answer
52 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
99 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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1answer
59 views

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
767 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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0answers
105 views

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
188 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
74 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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1answer
109 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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1answer
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
78 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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2answers
159 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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3answers
191 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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3answers
248 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
27 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
48 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
76 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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1answer
57 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
844 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
27 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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1answer
446 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
91 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
55 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
43 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
289 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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1answer
70 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
340 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
275 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
74 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
156 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
25 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
129 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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votes
1answer
60 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
417 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
167 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
5k 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
90 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 ...