Work power and efficiency Flashcards
1
Q
Equation for work done.
A
Work done =Force x distance
2
Q
Units for work done.
A
Joules (J)
3
Q
What is work done?
A
Energy transferred.
4
Q
Units for power
A
Watts (W)
5
Q
Equation for power.
A
Power = Energy transferred/time
6
Q
Units for time.
A
seconds (s)
7
Q
Define power
A
Rate at which energy is transferred.
8
Q
One watt is the same as…
A
1 joule per second.
9
Q
Equation for efficiency in terms of energy
A
efficiency = useful output energy transfer/total input
energy transfer
10
Q
Equation for efficiency in terms of power
A
efficiency = useful output power/total input power
11
Q
Units for efficiency
A
No units
12
Q
Units for force
A
Newtons (N)
13
Q
One Joule is the same as…
A
one Newton-metre
14
Q
The minimum value of efficiency
A
0
15
Q
The maximum value of efficiency
A
1
