Power Flashcards
What is power ?
The rate of energy transfer
What is power ?
The rate of energy transfer
What is power measured in ?
Watts
What does 1 watt equal ?
1 joule of energy transferred per second
What is equation one for power?
Energy transferred divided by time
What is equation 2 for power ?
Work done divided by time
What does the word dissipated mean ?
The energy is transferred to useless stores
What is usually the energy of the useless stores ?
Thermal stores
How can your reduce the amount of energy waisted ?
Using lubricants, reduces friction between objects for example oil
What happens when an object is heated ?
That part of the material gains energy and the energy is transfered to the rest of the material, which is know as conduction
What is thermal conductivity?
Measure of how quickly energy is transfered by conduction through a material
What do materials with a high thermal conductivity do?
Transfer lot’s of energy within a short time
What do material’s with a high conductivity called?
Thermal insulators can reduce unwanted transfer by heating
