Key Equations Flashcards
1
Q
Kinetic Energy
A
1/2 x mass (kg) x v^2 (m/s)
2
Q
Elastic Potential Energy
A
1/2 x spring constant (N/m) x e^2 (m)
3
Q
Gravitational Potential Energy
A
E = m (kg) x g x h (m)
4
Q
Power (linked with energy transferred)
A
P (w) = Energy Transferred (j) / TIme (s)
5
Q
Power (linked with work done)
A
P (w) = Work done (j) / Time (s)
6
Q
Efficiency
A
Efficiency = Useful energy out / Total energy in
7
Q
Change in thermal energy
A
E = m x specific heat capacity x change in temperature
8
Q
What links resistance, current and power?
A
Power (W) = I (A) x V
9
Q
Charge
A
Charge (c) = Current(A) x Time(s)
10
Q
What links resistance, current and PD
A
V = I x R
11
Q
Density
A
Density = mass/volume
12
Q
Energy change (using specific heat capacity)
A
Change in thermal energy = mass x specific heat capacity x temperature change
