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!