hey guyz..these are the equations we may need to use in igcse cz i gt this frm a site which stated that....here they are u may copy them ina notepad or microsoft wrd..>>>>
Electricity
P = V x I. Power = Voltage x Current.
V = I x R. Voltage = Current x Resistance.
Q = I x t. Charge = Current x time.
E = V x Q. Energy = Voltage x Charge.
Transformer Equation
Total Cost = Number of Units x Cost per Unit.
Energy
Efficiency (%) = (useful energy out ÷ total energy in) x 100.
GPE = mgh. GPE = mass x gravity x height.
KE = ½mv2. Kinetic Energy = 0·5 x mass x velocity2.
W = F x d. Work done = Force x distance.
W = E. Work done = Energy transferred.
P = E ÷ t. Power = Energy ÷ time.
Forces and Motion
s = d ÷ t. speed = distance ÷ time.
a = (v-u) ÷ t. acceleration = change in velocity ÷ time.
F = m x a. Force = mass x acceleration.
w = m x g. weight = mass x gravity.
m = F x d. moment = Force x perpendicular distance from pivot.
p = F ÷ a. pressure = Force ÷ area.
d = m ÷ v. density = mass ÷ volume.
Waves
v = f x l. velocity = frequency x wavelength.