SAMPLE PROBLEMS
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What quantity of electrical energy can a charge of 10 coulombs give if it goes through a resistor at a tension level of 12 volts?
U = 12 q = 10 E = U x q
12 x 10 = 120 joules
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A water-heater of 1 800 watts is on for 10 hours. What does that cost at a usage rate for electricity of 0,08$ per kWxh ?
P = 1 800 watts
= 10 hours
This represents 1 800 x(10) kWxh
@ 0,08$
= 1,44$

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