# WVU PHYS 102 - Electrical Energy and Power (2 pages)

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## Electrical Energy and Power

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## Electrical Energy and Power

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Electrical Energy and Power

Lecture number:
11
Pages:
2
Type:
Lecture Note
School:
West Virginia University
Course:
Phys 102 - Introductory Physics
Edition:
1
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Unformatted text preview:

PHYS 102 1nd Edition Lecture 11 Outline of Last Lecture I Resistance Resistivity and Ohm s Law Outline of Current Lecture II Electrical Energy and Power Current Lecture II Electrical Energy and Power A Electrical Energy and Power Equations P Energy Time I V J t Watt W P Energy Time PE V PE q PE q V P Energy time qV t P IV B Electrical Energy and Power Applications 1 pg 612 34 If electrical energy costs 0 12 per kilowatt hour how much does it cost a burn a 100 W lightbulb for 24 h b Operate an electric oven for 5 0 h if it carries a current of 20 0 A at 220 V b P IV 20 220 4400 Watts These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute t 5 hours Energy pt 4400 W 5 hours 22000 Wh Energy 22 000 Wh 22 kWh Cost 0 12 X 22 kWh 2 64 2 Common Voltages in Everyday Appliances a Voltage in our homes offices 110 120 V b Overseas 220 240 V c In US overseas the current is AC alternating oscillating not DC i In the US it is oscillating 55 times per second or 55 Hz ii Overseas it is 60 Hz

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