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No.

The computer uses a lot of power when first booting, but this only lasts a couple seconds before it reduces considerably. It will reduce further when the system is on and idle after booting.

The amount of power saved by turning the PC off for 5 minutes is equivocal, approximately, to the power used in 1 minute of it being on and idle.

An idle PC uses typically 80 to 400 watts of power. And a PC that is off uses typically less than 10. (If unplugged, none at all.) A PC on and in-use, such as gaming, typically uses 150 to 2500 watts, varying vastly.

These figures are for desktops. Laptops use less power overall. But it ALWAYS uses less power to turn a PC OFF, than to leave it on.

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13y ago
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14y ago

no leaving your computer on uses some energy

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13y ago

No, unless you count the energy used in recharging the battery when the computer is off.

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12y ago

it will use less electricity if you turn the brightness lower

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10y ago

It depends. If you're turning the computer on and off more than twice in an hour, it's more cost effective to simply put the machine into sleep mode.

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15y ago

Leaving it on.

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Q: Does computer use much electricity if left switched on?
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