Power problem 13

Determine the correctness of the statement:

  • An electric machine that does the same job in less time has more power.

  • The unit of electrical power is joules per second [J/s].

  • An electric drill that has more power will do more work.

  • Two bulbs are connected to the same voltage. The current through the first bulb is twice as much as the current through the second bulb, so the first bulb has twice the power than the second.

  • The power of the electric furnace is greater with a longer heating wire.


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