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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Durability of a battery

I have a device that consumes 10W and I have a 12V x 4.5Ah = 54Wh lead-acid battery, does that mean that my device can work continuously for 5.4 hours? Does the same concept apply to lithium batteries?...
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The LED bulb in my room has written 9 kWh/1000h on the box; what does that mean? [closed]

I bought a LED bulb for my room which uses 8.2 W power = 60 W conventional. I know this means it's a 8.2 W LED bulb which gives a brightness equivalent to a 60 W incandescent bulb. So here it says 9 ...
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Resistor losses in heat

I am trying to understand the power lost via heat (friction) from a resistor as opposed to what flows through and is available for the next component in series, and how I estimate this. I have read a ...
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Arduino board consumption benchmark

I know consumption depend of the type of application, but I would like to know if a comparison of average consumption exist between arduino and similar boards (Teeny/Dfrduino...). The board I am ...
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Help me understand the calculation of the current consummated by LM7805

Please help me understand how to calculate the current consummated by LM7805 during its work. Parameters: V(in) = 12V V(out) = 5V I(load) = 10mA (0.01A) The image ...
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ATMega32u4 power consumption with CLKDIV8

I have a little board with an ATMega32u4, that's run straight off USB voltage. There are no peripherals on board that should draw power (no LDOs or anything, LED is off). It has a 16MHz crystal. The ...
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Calculating watt usage from an input/output electronics spec for step-down transformer's minimum watt limit

I'm trying to calculate the minimum watt limit needed for a step-down transformer that convert 220 V to 120V from source (220V) to 125V smart plug then to an electronic appliance with the following ...
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how to read power labels on home appliances?

I want to know how to read the power label of a home appliance in order to estimate energy cost. I have provided a picture of an example power label What i understand from the provided label is I use ...
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ESP32 bootstrap pins power consumption

The other day, I tried that connect to GPIO15 and GPIO5 GND with 26.7 kohm pull down resistor despite having a internal pull-up beacuse of IO obligation. I had no problems during a booting. Please ...
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How do I compute the power consumption of an audio amplifier?

I intend to use this audio amplifier in my project : PAM8019 It has two analog inputs : left channel and right channel. It has two analog ouputs, which are the amplified inputs. Let's say I follow the ...
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Gasoline generator + Peltier configuration

I have a DIY cooler box with Peltier element 12V/3A/27 watts and want to connect via power supply to gasoline generator with output 600W at 5A max. Would that be a problem and not supply my Peltier ...
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Does an amplifier consume any power when nothing is connected? (GPD2846A built-in 2W amplifier) [closed]

The GPD2846A module has a built-in amplifier into it. However, I want to use it with my headphones which don't require 1-2W (they are definitely going to distort sound and possibly be damaged). So I ...
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VL53L3CX XSHUT PIN PROBLEM IN DEEP SLEEP

I have project using a VL53L3CX distance sensor. Also , I control it by ESP32. In normally, I can command to XSHUT pin. And I can read xshut pin of ESP32 that is 3V3 or 0V. But, When ESP32 enters deep-...
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How is power consumed by an induction motor calculated based on speed (from a VFD) and torque induced by the rotor shaft?

I've been tasked with carrying out some design improvements on my company's production floor. There is a flat belt conveyor assembly line, whose movement forward movement is controlled by a single ...
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For a mathematical operation in CPU, could power consumption depend on the operands?

Obviously, the number of operations affect a CPU's power consumption, but does it solely depend on the operations themselves? For example, adding 0 and 1 involves setting one single bit, but adding ...
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How does this LED last this long?

Before the end of last year, dad asked me for some small red light for his cabin, to pretend there is an alarm activated. He wanted it battery powered, so it can glow when electricity is turned off. I ...
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STM32F030 High current in stop mode

I would like to put STM32F030K6T6 into STOP mode (low power mode), in which there should be current consumption around 5 μA. But whatever I do the current consumption is around 450 μA in stop mode. ...
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Do higher voltages cause heating?

I'm trying to wrap my head around energy consumption in general. For some background info, I'm an engineering student and am familiar with the usual electrical engineering formulae Here is what caused ...
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Can increasing the wire gauge reduce your electric bill?

I was in a seminar and heard the presenter say something I am not able to understand. The statement was that if you use a higher gauge wire it would help reduce your electricity bill. Since I was not ...
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Camera + Accessories and power

I work with movie cameras. Unlike normal cameras, they have many types of batteries, sizes, etc that can power them. Many attachments (wireless video transmitters, follow focus systems, monitors, etc) ...
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What is the power consumption of an amplifier while powering a pair of speakers?

I need help getting power consumption to pick the right battery for a portable sound contraption. I have an amplifier with the following specifications: Class D 100 W MAX Power Output X 2 (4 ohms, 20 ...
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1 answer
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SIM7020 current consumption way too high

For a project I'm using the SIM7020 Narrowband-IoT (NB-IoT) module to send data to the cloud. The SIM7020 is controlled by an Arduino Pro Micro (ATmega32U4). Because the sensor is running on a ...
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Should I include Ivdd for total current consumption calculation?

I'm looking at the STM8L101K3T6 microcontroller for a timer and would like to calculate the average current consumption. It will stay active for only 5% of the time while it sleeps for the other 95% ...
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How many devices consuming 6.5W peak can I connect to a 100VA transformer?

Our customer wants to know the number of devices that they can connect to a transformer rated at 100VA. Our devices consume 6.5W peak when the batteries are charging. Here is my calculation and please ...
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Calculating battery life considering the capacity drops depending on load current (2 x 4 AA-packs in parallel)

This is a very recurrent question, about calculating the battery life given certain circuit current usage. This example will be similiar to this one in terms of the battery used and the consideration ...
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How does area of transistor affect power consumption

I knwo when you increase the area of a transistor of a circuit, the power consumption will be increased. I just want to know why is that case? Here is my circuit in spice
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What is energy consumption of a circuit

I am currently working on my coursework, and one of the questions is about measuring the energy consumed by my circuit during the 5 μs period of the simulation as the power supply voltage, VDD, is ...
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Measure mWh - mAh of an MCU-centered circuit [closed]

I build battery-powered circuits with MCUs that consume a few uA in sleep "stage." For total power consumption measurement (and therefore battery-lifetime), I used to use this but recently ...
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Can someone explain the unusually high minimum supply current of ESP32-WROOM-32E?

I had chosen the FireBeetle 2 ESP32-E board for a future project. I started looking at the power consumption details and I came across this posting. It's about some mysterious startup current draw ...
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How to calculate the power consumption of an ultrasonic distance sensor?

I’m working on a project that will be using an ultrasonic distance sensor continuously throughout the day. I want to figure out what the theoretical power consumption would be over a number of hours ...
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Do MOSFETs overheat in the off state? [closed]

I'm dealing with a 30N60 power MOSFET connected to a 15 A 12 V battery (acting as a switch.) Do such MOSFETs overheat or consume a lot of energy in the off state? (When the gate is off.)
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How much power will a 4kW BLDC motor use if ran for 3 hours?

My college is participating in a competition to build a solar car with batteries. After doing calculations, we have decided on using a 72V, 4000W BLDC motor. Now, we need to run the vehicle for 250km ...
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ESP8266/ESP-12F gets damaged when powered by LDO (LD1117v33) every time

Every time I connect a new ESP8266 (ESP-12F) to a new LD1117v33, as long as I insert an ammeter in between, it runs fine. It consumes about 70mA during normal running, and almost 0mA when in deep ...
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Energy consumption Calculation

I work for a food processing plant and working on a project that calculates energy consumption. Am having a hard time converting information given by the manufacture to calculate the average kWh. ...
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How to find the capacitance at a point?

I wanted to find the capacitance at X,Y,P and Q in the diagram given below. Idea was to find the dynamic power consumption of the circuit and for that we need the capacitance(I got this idea from a ...
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CMOS AND Circuit calculate power consumption

I need to calculate the power consumption of the CMOS AND circuit and I tried to figure it out myself but I really don't have a clue. I don't need the full answer but a first step into the right ...
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Power consumption of an inverter

I want to calculate the consumption of a PV inverter connected to a 50 kW PV plant. In the datasheet of the inverter it is written that the consumption of the inverter is: < 0.24% of Pac,r. I ...
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Unexpected huge MOSFETs power consumption

I have 2 MOSFETs : NMOS --> Ref :BSZ520 Rds_on : 52 mohms PMOS --> Ref :IRF9640 Rds_on : 500 mohms My ...
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Lighting System in terms of its efficiency and consumption

I'm curious regarding some matters in my experiment session of Efficient Lighting System. There are 4 types of lamps which we measure the data to fill-in the table as in the picture. Correct me if my ...
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How do ASIC designers approach designing for extremely low supply voltages like 0.3V?

In ASIC design, there is a tradeoff between performance and energy efficiency. Since most consumer CPU's are designed for maximum performance, they operate at high voltages and clock frequencies, ...
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ATMEGA1284p and RFM95 sleep current around 35µA: can it be reduced further?

In my project, I am using an ATMEGA1284p processor in the TQFP-44_10.0x10.0x0.8P package as well as a RFM95 LoRa module. For the low-power mode, I'm using the rocket scream low-power library: https://...
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Why don't GPS satellites experience power outage more often than they should?

With the advent of smartphones I would believe that there's this huge exponential growth in number of GPS receivers around, and by now there should be an unaccountable number of devices on earth ...
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Could a PC consume more power from the plug if it oparates in a colder enviroment?

I have a mining rig (computer using its processing power to calculate hashes in order to eventually be rewarded with cryptocurrency tokens.) The program I use to mine tells me each time the power ...
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How to reduce power in barebone setup of atmega328p?

For every 15 minutes once ultrasonic sensor data will be send to the receiver using nRF24L01. I'm using atmega328P with battery power using AAA*3 battery and it should operate at least 15 days. Can ...
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Leakage current through push-button and switch

I am developing a battery-powered application on a custom PCB, thus power consumption is critical. I am trying to minimize current consumption with stm32L4 MCU, by turning floating pins to analog, ...
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Power efficiency with Boost vs Buck-Boost using same regulator

I'm doing a few tests and figuring out what will be the best option for what will eventually be part of a battery powered circuit. I have both a boost and buck-boost converter, both using the XLSEMI ...
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3.7V to 7.5V step up circuit

I need a circuit which can step up the voltage from my 3.7V Li Ion battery to 7.5V. The current requirements are pretty small (up to 50mA max), but I have a latching solenoid which requires a short 7....
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MC34063A power consumption calculation

I'm designing a circuit based on the MC34063A switching regulator to step up 3.7V to 8V. The 3.7V for Vin comes from a 3.7V Li Ion battery and so I'm trying to calculate the battery life. I'm a bit ...
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Do electricity distribution companies charge apparent power (VA) or effective power (W) [duplicate]

If there is a load connected to a power outlet during one hour, where average apparent power is 1000VA and average effective power is 800W, what will be charged by the eletricity distribution company? ...
3 votes
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What happens with the power grid if nobody uses electricity?

How much electricity does consume electric system by itself? Just to have an option at any moment to plug in anything at socket at home and turn it on. There are huge power plants to convert high ...
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