How much electricity does it take to charge your mobile device? I've wanted to do this math for a while, but, alas, this kind of math is not my strong point.
So I poked around and found this tidbit on laptop battery charging cost.
I copied this from yahoo answers,
i tried many to search it but cannot find a straight answer
so here is my question how many unit( kwh) of electricity will be used to charge a 4000mAh laptop or any other battery.
if further details are required
its 10.8V li ion
electricity on grid is 240 V 50 Hz.
so here is my question how many unit( kwh) of electricity will be used to charge a 4000mAh laptop or any other battery.
if further details are required
its 10.8V li ion
electricity on grid is 240 V 50 Hz.
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6 answers
Best Answer: 4000 mA = 4A.
It delivers 4A for one hour, at 10.8 V.
That's 4 x 10.8 = 43.2 Watt hours, or 0.0432 kWh.
It will take 0.0432 "units" (as you call them) to charge the battery, assuming 100% efficiency.
I pay $0.12 per kWh, so to charge that battery would cost me $0.12 x 0.0432 = $0.00518.
If I charged it 10 times, it would cost 5 cents.
It delivers 4A for one hour, at 10.8 V.
That's 4 x 10.8 = 43.2 Watt hours, or 0.0432 kWh.
It will take 0.0432 "units" (as you call them) to charge the battery, assuming 100% efficiency.
I pay $0.12 per kWh, so to charge that battery would cost me $0.12 x 0.0432 = $0.00518.
If I charged it 10 times, it would cost 5 cents.
So...5 cents to charge my laptop,
How many laptops are there? 1/2 a billion? 1/4 billion? Lets go with just 100 million.
so .05 * 100,000,000 = $5,000,000
how often do you charge your laptop? let's be really conservative and say once a week.
that's 5,000,000 * 52, or $260,000,000 !!
TWO HUNDRED AND SIXTY MILLION DOLLARS PER YEAR
ONE QUARTER OF A BILLION DOLLARS IS SPENT ON CHARGING LAPTOPS!!!
OK, so for the sake of conversation, lets say that charging your phone is only 1% of that.
Are you telling me that all that talking is worth 2.6 Billion dollars??
Imagine what we could do with that money. Schools, healthcare, social services. The list goes on.
BUT WAIT...That's only half of it.
What about the cost of generating that energy to charge the devices? Fuck it...I can't even start to calculate that.
Here's my point...what does our incessant need to talk *RIGHT NOW*, cost us, as a society?
I don't know about you, but I'm pretty embarrassed.
And if you happen to be a really smart person and can provide a reasonable calculation of how much it costs to create the juice for the electronics,,,that would be a pretty cool comment.
So here it is, one last time...
Conserve Energy, Shut Up!
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