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Electric PowerLesson 2.5
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Key ConceptsHow do you calculate electric power?
What factors are used to determine how people pay for electrical energy?
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Energy TransformationAn electric appliance transforms electrical
energy into another form.
The energy transformation enables the appliance to perform its function.
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AppliancesFor example, a hair dryer transforms electrical
energy to thermal energy for drying hair.
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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).
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Power RatingsA bright light bulb transforms (or uses) electrical
energy at a faster rate than a dimmer bulb.
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Power RatingsAppliances used in the home vary greatly in
their power ratings. New appliances are sold with labels that show the power rating for each product.
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Power CalculationThe power of a light bulb or appliance depends
on two factors: voltage and current.
You can calculate power by multiplying voltage by current.
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Power CalculationThe 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 CurrentP = V I
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Key ConceptsHow do you calculate electric power?
What factors are used to determine how people pay for electrical energy?
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Electrical BillThe electrical bill that comes to your home
charges for energy use, not power.
Energy use depends on both power and time.
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EnergyThe 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
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Kilowatt-hoursElectric 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
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Electric MeterThe 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.
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Key ConceptsHow do you calculate electric power?
What factors are used to determine how people pay for electrical energy?
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Skill Check 2.51. The rate at which energy is transformed from
one form to another is known as…
a) power
b) voltage
c) current
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Skill Check 2.52. You can calculate power by…
a) Voltage / Current
b) Kilowatts x Hours
c) Voltage x Current
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Skill Check 2.53. The total amount of energy used by an
appliance is equal to…
a) Voltage / Current
b) Kilowatts x Hours
c) Power x Time
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Skill Check 2.51. The rate at which energy is transformed from
one form to another is known as…
a) power
b) voltage
c) current
![Page 20: 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?](https://reader030.vdocuments.mx/reader030/viewer/2022020301/5a4d1b5c7f8b9ab0599ab7e5/html5/thumbnails/20.jpg)
Skill Check 2.52. You can calculate power by…
a) Voltage / Current
b) Power x Time
c) Voltage x Current
![Page 21: 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?](https://reader030.vdocuments.mx/reader030/viewer/2022020301/5a4d1b5c7f8b9ab0599ab7e5/html5/thumbnails/21.jpg)
Skill Check 2.53. The total amount of energy used by an
appliance is equal to…
a) Voltage / Current
b) Power x Time
c) Voltage x Current