P2 - Energy And Power In Circuits Flashcards
What 2 factors cause more heat in a component?
More current & bigger voltage.
What do filament lamps do?
They pass a current through a thin wire, so much that it glows.
They waste a lot of energy as heat.
What is a more energy efficient appliance?
More of their total electrical energy output is transferred to useful energy.
Name 2 energy efficient alternative to filament bulbs.
1) compact fluorescent lamps (CFLs).
2) light emitting diodes (LEDs).
What are the pros and cons of using CFLs and LEDs over filament bulbs? [2].
- cost more to buy.
+ saves money in long term.
What is the formula for energy transferred?
Energy transferred = power rating x time.
What happens when current flows through anything with electrical resistance?
Electrical energy is converted into heat energy.
