 Rate at which energy is consumed or produced  Changed into other forms of energy  Measured in WATTS (W)

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Presentation transcript:

 Rate at which energy is consumed or produced  Changed into other forms of energy  Measured in WATTS (W)

 Formula is P=IV  Power=Current x Voltage P VI Units: Power: watts Voltage: volts Current: amps

 Depends on POWER (kW) and TIME (h)  Units are kWh  The amount of electrical energy used in a home depends on the power of the electrical devices in the house and the length of time that those devices are on

 Example: A coffee pot operates on 2 amperes of current on a 110-volt circuit for 3 hours. Calculate the total kWh used.  Step 1: Determine Power (P=VI)  P = 110 Volts x 2 amps  P= 220 watts  Step 2: convert watts to kilowatts  220 watts/1000 = 0.22 kW  Step 3: Multiply by the hours given in the problem  0.22 kW x 3 hrs = 0.66 kWh

 What is the cost of using the coffee pot if the cost of energy is $0.15 per kWh?  Step 1: Multiply the kWh by the cost  0.66 kWh x 0.15 = $0.099

Appliance found Power used (kW)Average time on a day (h) Energy Used (kWh) Cost per kWh ($) Cost of running the appliance ($) Ex. Blender.3751 hour Total cost to run the room for one day