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Power & Energy. Who is the most powerful?. Which device uses the most power?. To calculate the power. Power =. Voltage x. Current. P = V x I. Who uses the most energy?. To calculate the energy transferred. Energy transferred =. Power x Time. What is the cost of this energy?.
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To calculate the power Power = Voltage x Current P = V x I
To calculate the energy transferred. Energy transferred = Power x Time
What is the cost of this energy? Units used = Power x time Total cost = Number of units x Cost of per unit