Jag Mark In terms of electrons, how can an uncharged object become charged?
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Transcript of Jag Mark In terms of electrons, how can an uncharged object become charged?
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Jag MarkIn terms of electrons, how can an
uncharged object become charged?
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Electric PowerNotes
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Electric Power
All electrical appliances change electrical energy into another form of energy. For example, a hair dryer changes electrical energy into thermal energy.
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Electric Power
Power is the rate at which energy is changed from one form to another. The unit of power is the watt, which is abbreviated as W. Each electrical device has a power rating.
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Electric Power
The power of an electrical device depends on the voltage and the current. The equation to calculate power is:
Power = Voltage X Current
where
Watts(W) = Volts(V) X Amperes(A)
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Electric Power
You can use the symbols P for power, V for voltage, and I for current. Using these symbols, the power equations can be written this way:
P=VI
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Electric Power
Utilizing Ohm’s Law and the equation P=VI, the following equations can be used to calculate watts as well:
P=V2/R
or
P=I2R
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Electric Power
A clock radio uses the standard voltage of 120V. The clock radio has 0.1A of current in it. What is the power rating of the clock radio?
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Electric Power
A hair dryer has a power rating of 1200W and uses a standard voltage of 120V. What is the current through the hair dryer?
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Paying for Electrical Energy
Different appliances change electrical energy into other forms of energy at different rates. The more you use an appliance, the more energy it consumes.
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Paying for Electrical Energy
The equation to calculate the amount of energy an appliance consumes is:
Energy = Power X Time
The unit of electrical energy is the kilowatt-hour, which is abbreviated as kWh. One kilowatt is equal to 1000 watts.
Therefore:
Kilowatt-hours = Kilowatts X Hours
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Paying for Electrical Energy
Ten 100W light bulbs turned on for one hour use 1,000 watt-hours (or 1 kilowatt-hour) of energy.
E = PT
E = 10(100W) X 1 Hour
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Paying for Electrical Energy
The amount of electrical energy used in your home is measured by a meter. As more lights and appliances are turned on, you can observe a dial on the meter turning more rapidly.
In general, you pay a few cents for every kWh of electrical energy you consume.
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240V Charger 24kWh Battery Pack
Charges in 8 HoursWhat is the current?
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Nissan Leaf Charging Current
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Nissan Leaf Charging
Based on the derived information, how much resistance does the Leaf system apply to the current?
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Nissan Leaf Charging Resistance
R = V/I
R = 240V / 12.5A
R = 19.2Ω