A plugged-in phone charger has become a common sight in households, often left even when not actively charging a device. There are a few reasons why leaving your charger plugged in without your phone is not as harmless as it seems.
The Power of A Phone Charger

Chargers consume power even when not actively charging a device. A test using a genuine Apple phone charger revealed that it uses approximately 130W of power a month, translating to 1.5KWh a year. While this might seem negligible at first glance, the cumulative effect becomes significant when considering multiple chargers.1
