Figuring Out Wattage of My Laptop - Mark's Query

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    Laptop Wattage
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Discussion Overview

The discussion revolves around determining the wattage consumption of a laptop based on its specifications. Participants explore the relationship between current, voltage, and power, as well as considerations regarding battery charging and efficiency of the power supply.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • Mark states that the power consumption is calculated as 90.09 watts based on the formula of current multiplied by voltage (4.62 amps * 19.5 volts).
  • One participant expresses uncertainty about whether the 4.62 amps is the constant current draw, suggesting it may vary, especially when the battery is charging.
  • Another participant clarifies that the figure of 90 watts represents power consumption, while energy consumption over time is measured in watt-hours.
  • A different participant notes that the efficiency of the power brick should be considered, estimating the total power requirement to be around 100.1 watts due to typical efficiency losses.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the constant nature of the current draw or the implications of efficiency on total power consumption, indicating multiple competing views remain.

Contextual Notes

There is a lack of clarity regarding the variability of current consumption during different operational states of the laptop, as well as the specific efficiency rating of the power supply used.

barneygumble742
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hi,

the attached image is from the back of my laptop.

i'm trying to figure out how much watts it consumes per hour.

i know that power is current multiplied by volts. so its 90.09 watts = 4.62 amps * 19.5 volts. is this the watts per hour?

thanks,
mark
 

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I'm not sure, but the 4.62 amps may be what it takes to run the laptop as well as charge a low battery. It may not take this much current all of the time. Once the battery is charged current consumption probably drops off.
 
"...is this the watts per hour?"

This is the amount of power consumed. The energy from 90 watts for one hour is 90 watt-hours; for two hours is 180 watt-hours.
 
And you have to take in account the efficiency of the power brick, usually in the range of 90%, so the total power will be around 100.1 W
 

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