Efficiency Flashcards
1
Q
What do we call the variables that we keep the same in an investigation
A
Control variables
2
Q
What do we call the variables that we change
A
Independent variable
3
Q
What do we call the variable that we observe
A
Dependent variable
4
Q
What do we mean by conservation of energy
A
Total energy before transfer=Total energy after transfer
5
Q
Energy transfer formula
A
Total energy supplied= Useful energy transferred + wasted energy
6
Q
Energy efficiency
A
It tells us the percentage of energy supplied that is usefully transferred. The higher the percentage, the better the device is at transferring energy usefully.
7
Q
Energy efficiency formula
A
Efficiency(%)=Useful energy transferred/Total energy supplied x100
