Electrical Power Chapter 19 Section 3. Energy to Power Electrical Power is the rate of conversion of electrical energy. Electrical Power is the rate of.

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Presentation transcript:

Electrical Power Chapter 19 Section 3

Energy to Power Electrical Power is the rate of conversion of electrical energy. Electrical Power is the rate of conversion of electrical energy. To push charge through a conductor, work must be done. To push charge through a conductor, work must be done. That work is a form of energy (Electrical Potential Energy) and when used over a certain time, power is created. That work is a form of energy (Electrical Potential Energy) and when used over a certain time, power is created.

Electrical Power Equation

Electrical Companies Electrical Companies measure energy consumed in Kilowatt-hours. Electrical Companies measure energy consumed in Kilowatt-hours. 1kWh = 3.6x10 6 J 1kWh = 3.6x10 6 J The cost of a kWh can be between $0.05 to $0.20 The cost of a kWh can be between $0.05 to $0.20 –The average kWh in USA for 2011 is $0.1099

High Voltage and Energy Transmission Electrical Energy is transferred at high potential differences to minimize energy lost. Electrical Energy is transferred at high potential differences to minimize energy lost. P = IV P = IV P = I²R P = I²R –By decreasing the current and increasing voltage in power lines it reduces the resistance of charge flowing through the power lines.