Does a cellphone or a computer use energy when they're plugged in but the battery's fully charged?
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I am supposed to measure my energy use during an entire week for a project and I was wondering if the energy use of a cellphone is the entire time that it's plugged in or just the time it takes for the battery to be fully charged?
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Answer:
The cellphone uses more while the battery is down and charging and reduces the draw to a very small amount once the charge is full. The computer if it is a laptop will do the same. In the case of the laptop it actually reduces life of the battery to leave it charging once it is fully charged since they are being slightly overcharged at that point. If you notice that batteries that are fully charged and are continuing to be charged are warm, then you know that the energy is being completely wasted by needlessly overcharging.
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Other answers
yes Even if the plug is still in the socket and the phone isn't even plugged it will still use energy
Ali
anything that is plugged in is using energy. if you plug in a lamp, but dont turn it on. it is still using energy.
foreverisalongtime
Yes, as it is still powering the inverter/rectifier which converts the AC current into a lower-voltage direct current which is used to charge the battery.
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