Equations - Paper 1 Flashcards
Charge?
Current x time
Q = I t
Potential difference?
Current x resistance
V = I R
Electrical Power (In terms of potential difference and current)?
Potential difference x current
P = V I
Power (in terms of current and resistance)?
(Current²) x resistance
P = I²R
power (in terms of energy and time) ?
Energy transferred / time
P = E/t
Energy transferred (in terms of charges and potential difference)?
Charge x potential difference
E = Q V
Density?
Mass / volume
d = m/v
Period?
1 / frequency
Boyle’s Law?
this is on the formula sheet
pV = constant
this is on the formula sheet
Work done?
Force x distance moved
W = F D
Resistance?
Potential difference / Current
R = V/I
Efficiency?
Useful energy / Energy put in x100
E= useful/input x100
Kinetic energy?
1/2 x Mass x Speed²
Ek=1/2mv²
Gravitational potential energy?
Mass x Gravitational field strength x Height
Ep=mgh
Elastic potential energy?
this is on the formula sheet
1/2 x Spring constant x Extension²
Ee=1/2ke²
(this is on the formula sheet)