Lessons 9-12 Flashcards
1
Q
true or false
Power is work done over time taken which is equal to the energy change over the time taken.
A
true
2
Q
both power formulas?
A
P= W/Δt
P=ΔE/t
3
Q
what unit is ‘work done’ and ‘energy change’ taken in?
A
Joules, J
4
Q
what is the unit of power?
A
Watts, W
5
Q
Power can also be thought of as the..?
A
..rate of energy output or rate of energy transformed.
6
Q
formulas to calculate efficiency
A
Efficiency= useful energy output/energy input x 100%
Efficiency= useful power input/power input x 100%
