Energy And Power In Circuits Flashcards
What is anything that supplies electricity also supplying?
Energy
What do cells and batteries do?
Transfer energy to components in the circuit
What happens when current flows through anything with electrical resistance (most things)?
Electrical energy is covered into heat energy
What makes does more current flowing mean?
More heat is produced
Why does a bigger voltage mean more heating?
It pushes more current through
How does a filament bulb work?
By passing a current through very thin wires heating it up so much that it glows (this wastes a lot of heat energy)
What is an energy efficient appliance?
One that transfers more or their total electrical energy output to useful energy
What is an example of an efficient device?
Power saving lamps such as CFL’s (compact fluorescent lamps) waste less energy as heat than in ordinary filament lamps
What is the downside of efficient devices?
They’re more expensive to buy however the savings on electricity bills eventually covers the Cost
What is the power of a appliance?
The amount of energy that is uses per second?
How do you find power?
Power = energy transferred / time
