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Electric Power. Lesson 2.5. Key Concepts. How do you calculate electric power? What factors are used to determine how people pay for electrical energy?. Energy Transformation. An electric appliance transforms electrical energy into another form.

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Electric power

Electric Power

Lesson 2.5


Key concepts
Key Concepts

  • How do you calculate electric power?

  • What factors are used to determine how people pay for electrical energy?


Energy transformation
Energy Transformation

  • An electric appliance transforms electrical energy into another form.

  • The energy transformation enables the appliance to perform its function.


Appliances
Appliances

  • For example, a hair dryer transforms electrical energy to thermal energy for drying hair.


Power w
Power (W)

  • The rate at which energy is transformed from one form to another is known as power.

  • The unit of power is the watt (W).


Power ratings
Power Ratings

  • A bright light bulb transforms (or uses) electrical energy at a faster rate than a dimmer bulb.


Power ratings1
Power Ratings

  • Appliances used in the home vary greatly in their power ratings. New appliances are sold with labels that show the power rating for each product.


Power calculation
Power Calculation

  • The power of a light bulb or appliance depends on two factors: voltage and current.

  • You can calculate power by multiplying voltage by current.


Power calculation1
Power Calculation

  • The units are watts (W) = volts (V) x amperes (A).

  • Using the symbols P for power, V for voltage, and I for current, this equation can be rewritten…

Power = Voltage x Current

P = V I


Key concepts1
Key Concepts

  • How do you calculate electric power?

  • What factors are used to determine how people pay for electrical energy?


Electrical bill
Electrical Bill

  • The electrical bill that comes to your home charges for energy use, not power.

  • Energy use depends on both power and time.


Energy
Energy

  • The total amount of energy used by an appliance is equal to the power of the appliance multiplied by the amount of time the appliance is used.

Energy = Power x Time


Kilowatt hours
Kilowatt-hours

  • Electric power is usually measured in thousands of watts, or kilowatts (kW), and time is measured in hours.

  • The unit of electrical energy is the kilowatt-hour (kWh).

Kilowatt-hours = Kilowatts x Hours


Electric meter
Electric Meter

  • The amount of electrical energy used in your home is measured by a meter.

  • The electric company uses the meter to keep track of the number of kilowatt-hours used.


Key concepts2
Key Concepts

  • How do you calculate electric power?

  • What factors are used to determine how people pay for electrical energy?


Skill check 2 5
Skill Check 2.5

  • The rate at which energy is transformed from one form to another is known as…

  • power

  • voltage

  • current


Skill check 2 51
Skill Check 2.5

  • You can calculate power by…

  • Voltage / Current

  • Kilowatts x Hours

  • Voltage x Current


Skill check 2 52
Skill Check 2.5

  • The total amount of energy used by an appliance is equal to…

  • Voltage / Current

  • Kilowatts x Hours

  • Power x Time


Skill check 2 53
Skill Check 2.5

  • The rate at which energy is transformed from one form to another is known as…

  • power

  • voltage

  • current


Skill check 2 54
Skill Check 2.5

  • You can calculate power by…

  • Voltage / Current

  • Power x Time

  • Voltage x Current


Skill check 2 55
Skill Check 2.5

  • The total amount of energy used by an appliance is equal to…

  • Voltage / Current

  • Power x Time

  • Voltage x Current


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