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Iceland uses a voltage of 220v instead of of the US 110v. So you fly to Iceland with a box of bulbs ,that has been assorted with 30, 60 and 90 Watt light bulbs.U connect it through icelandic electrical socket. The fact that u 'll actually be using AC current will affect neither the equation used nor your answer.
HINT: The light bulbs filaments' length , area, and resistivity do not change when connected to the generator.

  • Physics -

    So what is the question?

    Power= V^2/R so if V is doubled, power is quadrupled in the same resistance.

  • Physics-for bobpursley -

    Sorry for writing the incomplete question.
    But is how much power do your 30, 60, 90 watt light bubls use when connected to icelandic electrical sockets?

  • Physics -

    Re-read my answer.

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