Energy Efficiency Flashcards
1
Q
What is energy efficiency?
A
How much energy is useful.
2
Q
Formula?
A
Useful energy ➗ total energy input x 100
3
Q
Energy efficiency unit?
A
%
4
Q
A hairdryer wastes 376 J for every 1500J of electrical energy it uses. How efficient is the hairdryer?
A
1500-367 = 1124
1124 ➗ 1500 x 100 = 75%
