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Equations Chapter 7 & 8
Electric Energy Equation electric energy (in kWh) = electric power (in kW) X time (in hours) E= Pt
Electric Power Equation electric power (in watts) = current (in amperes) X voltage difference (in volts)
Ohm's law. current(in ampheres)= voltage difference(in volts)/ resistance (in Ohm's) I= V/R
The current in a clothes dryer is 15 A when it's plugged into a 240-Volt outlet. How much electric power does the clothes dryer use? current: I = 15A voltage difference: V = 240 V (power: P) ( P= IV) P= (15) (240)= 3,600 Watts.
A microwave oven with a power rating of 1,200 W is used for 0.25 h. How much electrical energy is used by the microwave? electric power: P= 1,200 W= 1.2 kW time: t= 0.25 h (electric energy used:E) (E=Pt) E=(1.2)(0.25)= 0.30 kWh
