How much power does a mobile phone charger consume when left in the plug with the switch turned on?

With no phone attached to the charger, it consumes about 0.5 Wh.

When a fully-charged phone is attached to the charger, it consumes about 1 Wh.

When a partially-charged phone is attached to the charger (aka when the phone is charging), it wastes about 4.5 Wh as heat and delivers about 2.5 Wh to the phone.

Source

PS: 1000 Wh costs about 10 pence in the UK and is equivalent to 0.52 kg CO2e.

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