By: Michelle, Yeovani, Jalen

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Presentation transcript:

By: Michelle, Yeovani, Jalen Electric Power By: Michelle, Yeovani, Jalen

What is electric power? The electric power used depends on the voltage difference and the current. Electric power can be calculated from the following equation.

Electric Power Equation Electric power (in watts)= current (in amperes) voltage difference (in volts) P=IV The unit for the power is the watt (W). Because the watt is a small unit power electric power is often expressed in kilowatts (KW). One kilowatts equals 1,000 watts.

Electrical Energy Using electric power cost money. However electric companies charge by the amount of electrical energy used rather than by the electric power used. Electrical energy usually is measured in the units of kilowatts hours (KWH) and can be calculated from this equation.

Electric Energy Equation Electrical energy (in kW) = electric power (in kW) E=Pt Time in hours In the above equation electric power is in the units of kW and the time is the number of hours that the electric power is used.