energy and efficiency Flashcards
1
Q
what is the weight of a 1 kilo object on earth’s surface
A
about 10 newtons
2
Q
what is the input energy
A
the input energy is the energy supplied to a device
3
Q
what is efficiency
A
efficiency is the useful output energy transferred by the device over the total input energy supplied to the device
4
Q
what is the maximum amount of efficiency of any energy transfer
A
the maximum amount of efficiency is 100% because you can never get enough energy from a machine that you put into it
5
Q
how do machines waste energy
A
Machines waste energy because of friction between their moving parts, air resistance, electrical resistance, and noise.
