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>> 1. Always sad for me to know how much popular are wireless chargers, wasting 47% more energy aprox for charging the same as a wired charger. Sure, but compa

>> 1. Always sad for me to know how much popular are wireless chargers, wasting 47% more energy aprox for charging the same as a wired charger. Sure, but compared to everything else we use, smartphones use almost no energy. The one I'm typing this on has a battery capacity of 12 wh; if you have a resistive electric water heater, standing in a hot shower during the winter for an extra second would offset half of that.

sowbug 3y ago
Ouch! I already feel bad about shaving in the shower! That is an evocative way to put it.
delecti 3y ago
This nerd sniped me and I had to do the math to confirm, but you're right, at least depending on where you get your estimates and regional power costs. The energy equivalent between a cell phone and shower time is on the order of seconds. My phone's battery is 4385 mAh @3.7V, or 0.016 kWh, and my power costs $0.1252/kWh, or about $0.002 per phone charge. Based on some super surface-level estimates from googling, a typical shower is about 2 gallon/min, and the cost to heat water is about $0.01-0.02 per gallon, meaning for me it's actually about 4 seconds of hot water per phone charge.
- wryanzimmerman 3y ago
  And the parent comment said “47% wasted power … extra second … would offset half of that” and 47% of four seconds is about two, half of that is one second, so I’d say that was shockingly accurate, wow!
- asolidtime1 3y ago
  Yeah, the math I did was for heating water by 50 kelvins for a 9 l/min showerhead, which in hindsight was probably overestimating it. It'd make sense if the actual answer for most people was 2-4 seconds
zlg_codes 3y ago
This is the one less eco-friendly thing I'm not letting go of. Hot showers are amazing.
- wizardwes 3y ago
  Did see an interesting thing recently about mist showers. You run them hotter than a normal shower, but they also use significantly less water, and therefore energy. That's always something to consider.
  - wkat4242 3y ago
    But the lower amount of water flowing will make it harder to remove soap suds from the hair, leading to longer shower times unless you like dandruff :) for me that's the longest part of showering.
    - fastball 3y ago
      Shave your head, easy-peasy.
- chrisweekly 3y ago
  Ice-cold showers are also amazing. And healthy!

sowbug 3y ago

Ouch! I already feel bad about shaving in the shower! That is an evocative way to put it.

delecti 3y ago

This nerd sniped me and I had to do the math to confirm, but you're right, at least depending on where you get your estimates and regional power costs. The energy equivalent between a cell phone and shower time is on the order of seconds. My phone's battery is 4385 mAh @3.7V, or 0.016 kWh, and my power costs $0.1252/kWh, or about $0.002 per phone charge. Based on some super surface-level estimates from googling, a typical shower is about 2 gallon/min, and the cost to heat water is about $0.01-0.02 per gallon, meaning for me it's actually about 4 seconds of hot water per phone charge.

wryanzimmerman 3y ago
And the parent comment said “47% wasted power … extra second … would offset half of that” and 47% of four seconds is about two, half of that is one second, so I’d say that was shockingly accurate, wow!
asolidtime1 3y ago
Yeah, the math I did was for heating water by 50 kelvins for a 9 l/min showerhead, which in hindsight was probably overestimating it. It'd make sense if the actual answer for most people was 2-4 seconds

zlg_codes 3y ago

This is the one less eco-friendly thing I'm not letting go of. Hot showers are amazing.

wizardwes 3y ago
Did see an interesting thing recently about mist showers. You run them hotter than a normal shower, but they also use significantly less water, and therefore energy. That's always something to consider.
- wkat4242 3y ago
  But the lower amount of water flowing will make it harder to remove soap suds from the hair, leading to longer shower times unless you like dandruff :) for me that's the longest part of showering.
  - fastball 3y ago
    Shave your head, easy-peasy.
chrisweekly 3y ago
Ice-cold showers are also amazing. And healthy!