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Is It OK to Leave Device Chargers Plugged in All the Time? An Expert Explains

  • Chargers consume power continuously when plugged in, even if not actively charging a device, a phenomenon known as vampire or standby power.
  • This standby power arises because chargers keep control and protection circuits running, and cumulative wasted energy can be significant over time in a household.
  • Wear and tear on chargers increases as electricity flows through them, especially during occasional voltage rises above their rated limits from the unstable electricity grid.
  • Lecturer Glen Farivar advises replacing chargers if they become warmer, noisy, or damaged, and cautions that cheap, uncertified chargers pose higher safety risks including fire hazards.
  • Modern chargers generally consume minimal standby power and are safe, but users should consider unplugging them if convenient to reduce waste and extend charger lifespan.
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The ConversationThe Conversation
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Is it OK to leave device chargers plugged in all the time? An expert explains

‘Vampire power’ is real.

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Most people have a phone charger plugged in by the bed that never bothers to disconnect. Is there a risk?

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The Conversation broke the news in on Tuesday, May 27, 2025.
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