Flashcards in Energy and Power in Circuits Deck (15):
Energy is [ ] from cells and other sources
Electricity is a form of energy therefore it's always [ ]
What component uses kinetic energy?
What component uses light energy?
What component uses heat energy?
Hair dryers / kettles
What component uses sound energy?
What happens when current flows through anything with electrical resistance?
The more current that the [ ] that is produced
Electrical energy is converted into heat energy
How does voltage effect the amount of heat due to resistance?
Bigger voltage means more heating because it pushes more current through
How do filament bulbs work?
By passing a current through a very thin wire, heating it up so much that it glows. They waste a lot of energy as heat
If an appliance is efficient it wastes [ ]
What doe 'more efficient' appliances do?
Transfer more of their total electrical energy to useful energy
Name 2 power-saving lamps that waste less heat energy than filament bulbs
1) Compact fluorescent lamps (CFLs)
2) Light-emitting diodes (LEDs)
Energy Transferred =
Energy Transferred (kJ) = Power (kW) * Time (s)
What is the formula for electrical power?
Power (W) = Current (A) * Potential Difference (V)