4 ms·

For ACs and cooking lunch, yes. For cooking dinner and artificial lighting, no.

• ben_w 8y ago
  Dinner is relevant. Lights… take a standard lightbulb form factor fill it with batteries and coat the outside with LEDs, and it can last most of the night.
  • djrogers 8y ago
    Now you’re right back where this started - accounting for the cost of batteries. Oh, and my stomach says dinner is most definitely not irrelevant.
    • ben_w 8y ago
      Said batteries cost about the same as the LEDs, which — combined — cost less than the electricity they use in their working life.
    • stale2002 8y ago
      It is an irrelevant portion of total electricity usage. It doesnt matter if a very small portion of your electricity usage has high costs.