equations Flashcards
1
Q
kinetic energy (J) =
A
1/2 X mass (kg) X speed^2 (m/s)^2
2
Q
g.p.e(j) =
A
mass X g.f.s X height
3
Q
elastic potential energy (j) =
A
1/2 X spring constant X extension^2
4
Q
change in thermal energy (j) =
A
mass X specific heat capacity X temp change
5
Q
power (w) = (2)
A
- energy transferred / time
- work done/ time
6
Q
efficiency = (energy)
A
-useful output energy transfer / total input energy transfer
7
Q
efficiency (power)=
A
useful power output/ total power input
8
Q
potential difference (V)=
A
current (A) X resistance
9
Q
energy transferred (j)=
A
power X time
10
Q
power= (p.d + current)
A
p.d X current
11
Q
energy transferred (charge flow)
A
charge flow X p.d
12
Q
density =
A
mass / volume
13
Q
specific latent heat =
A
mass X specific latent heat
