Module 3 - Power Flashcards
1
Q
What is meant by Power
A
A measure of the rate of work done
2
Q
What is the equation for power
A
P = W/t
3
Q
Give 2 units for Power
A
- Watt (W)
- J/s
-kgm²s⁻³
4
Q
What is the equation for power for motion under constant speed
A
P = Fv
5
Q
Derive P = Fv
A
P = W/t = Fd/t = Fv
6
Q
What is meant by the efficiency of a mechanical system
A
- The ratio of how much useful work is done by a machine
7
Q
What is the equation for efficiency in terms of work/energy
A
Efficiency = 100 x useful energy output/ total energy input
8
Q
What is the equation for efficiency in terms of power
A
Efficiency = 100 x useful power output/ total power input
