Electrical Power
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Lots of formulas so make sure you have pen and paper!
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10 Terms
Power
The rate of energy transformation per second
Unit of measurement of Power
Watt (W)
Formula for Watt
W = J/s
Formula for Power
P= I x V or P= VxV/ R
Formula for kWH
kWh = Wh/ 1000
Energy used (Kwh) formula
kWh= Power (kW) x Hours used (h)
Effect of voltage on brightness
More voltage—> More electrons pushed—> More current—> More power (More light emitted)—> More brightness
Effect of resistance on brightness
More resistance—> Electrons moving slowly—> Less current—> Less light emitted (Less power)—> Less brightness
Effect of current on brightness
More current —> More power—> More light being emitted—> More brightness
Relationship of power and brightness:
More power= more energy transformed into light—> more brightness!
Note 
Flashcards (25)