1) If 420 J of energy are absorbed by a resistor in 4 min, what is the power to the
resistor? (hint: must convert min to sec) .

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2) The power to a device is 40 joules per second (J/s). How long will it take to deliver
640 J ?

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3) How many joules of energy does a 2 W light dissipate in 8 h? and how many
kilowatthours does it dissipate?

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4) How long must a steady current of 1.4 A exist in a resistor that has 3 V across it to
dissipate 12 J of energy?

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