Standard Grade Physics
Formula sheet
ν = velocity or speed, m/s
Telecommunication
ν=
d
t
d = distance, m
t = time, s
f = frequency, Hz
λ = wavelength, m
ν=fλ
1
1
T=
T
f
Angle of incidence = Angle of reflection
f=
T = period of wave, s
Using electricity
V
I
P = I2 R
V=IR
R=
P=VI
E
P=
t
E=Pt
Q=It
V=
E
Q
In series: Rtotal = R1 + R2 + R3 + ...
In parallel:
1
RTOTAL
In a voltage divider:
=
R = resistance, Ω
P = power, W
E = energy, J
t = time, s
Q = charge, C
Vtotal
V1
V2
=
=
= ...
Rtotal
R1
R2
ν = speed or velocity, m/s
f = frequency, Hz
λ = wavelength, m
ν=fλ
1
f
I = current, A
1
1
1
+
+
+ ...
R1 R2 R 3
Health Physics
P=
V = voltage, V
f=
1
P
P = power of lens, dioptres (D)
f = focal length, m
x = number of half-lives
New activity of a radioactive source after x half lives =
original activity
2x
Half life is the time taken for the activity of a radioactive source to fall to half.
 S. Bakke
1/2
Electronics
V = voltage, V
V=IR
V
R=
I
P=VI
P = I2 R
Gain =
output
input
I = current, A
R = resistance, Ω
P = power, W
C = capacitance, F
Transport
ν = final) speed, m/s
d
ν=
t
d = distance, m
a=
v−u
t
F=ma
P=
E
t
E=Fd
E k = ½ m ν2
Ep = m g h
t = time, s
ν=u+at
a = acceleration, m/s2
W=mg
u = initial speed or velocity, m/s
F = force, N
m = mass, kg
E=Pt
W = weight, N
W=Fd
g = acceleration due to gravity, m/s2
= gravitational field strength, N/kg
P = power, W
E = energy, J
W = work, J
h = height, m
Energy Matters
energy out
x 100
η = efficiency, %
energy in
Ip
Vs
N
= s =
Vs, = Voltage across secondary coil, V
Vp
Np
Is
Principle of conservation of energy:
Vp = Voltage across primary coil, V
Ns = Number of turns, secondary coil
ItV = Eh = mc∆T
Np = Number of turns, primary coil
For a raise in temp., E = mc∆T
For a change in state, E = mL
Ip = Current through secondary coil, A
Is = Current through primary coil, A
Principle of conservation of energy:
E = Energy, J
Energy cannot be created or destroyed,
m = mass, kg
only transformed from one form into
c = Specific heat capacity, J kg-1 °C-1
∆T = Change in temperature, °C
another.
Lv, Lf = Latent heat of vaporisation, fusion
η=
 S. Bakke
2/2