Energy and power in circuits Flashcards
Where is energy transferred from?
Cells and other sources.
Anything which supplies electricity is also what?
Supplying energy.
Cells, batteries, generatrs etc all do what?
All transfer energy to components in their circuit.
Motion -
Motors.
Light -
Light bulb.
Heat -
Hair dryers/kettles.
Sound -
Speakers.
What do all resistors produce?
Heat when a current flows through them.
Whenever current flows through anything with an electrical resistance what happens?
Electrical energy is converted into heat energy.
The more currents that flows =
the more heat is produced.
The bigger the voltage =
more heating because it pushed more current through.
How do filmament bulbs work?
By passing a current through a very thin wire, heating it up so much that it glows.
What happens if an appliance is efficient>
It wastes less energy.
What do energy effieceint appliances do?
Transfer more of their total electrical energy output to useful energy.
For example where is less energy is wasted as heat?
In power saving lamps such as compact fluorescent lamps and light emitting diodes than ordinary filament bulbs.
