1. Electrical Power & Energy Chapter 7-3

2. Electrical Power F Power is the rate at which work is done F Electrical energy is easily converted into other forms of energy –Mechanical-Fans blades –Thermal-Hair dryer

3. F Electrical Power is the rate at which electrical energy is converted into other forms of energy

4. F Power = current X voltage F Units of Watts (W) or kilowatts (kW)

5. Electrical Energy F The amount of electrical energy used depends on the power required by the appliance and the length of time the appliance is used.

6. F Energy = power X time F E = Pt F Units of kilowatt-hour (kWh)

7. Cost of Using Electrical Energy F Multiplying the electrical energy used by the amount of the power company charges for each kWh. F Total cost=Power*time*cost F $=kW*hr*cost