GCSE SCIENCE (Double Award) Unit 3 Foundation
Equations
current =
voltage
R = R1 + R2
energy transferred = power  time
E  Pt
power = voltage  current
P  VI
energy [or power] usefully transferred
total energy [or power] supplied
mass
density 
volume
units used (kWh) = power (kW)  time (h)
cost = units used  cost per unit
wave speed = wavelength  frequency
speed 
SI multipliers
© WJEC CBAC Ltd.
V
R
resistance
total resistance in a series circuit
% efficiency 
Prefix
m
k
M
I
Multiplier
1  10-3
1  103
1  106
distance
time
 100

m
V
vf
GCSE SCIENCE (Double Award) Unit 3 Higher
Equations
current =
voltage
I
resistance
total resistance in a series circuit
R = R1 + R2
total resistance in a parallel circuit
energy transferred = power  time
1 1 1
 
R R1 R2
E  Pt
power = voltage  current
P  VI
power = current2  resistance
P  I 2R
% efficiency 
energy [or power] usefully transferred
total energy [or power] supplied
mass
density 
volume
units used (kWh) = power (kW)  time (h)
cost = units used  cost per unit
wave speed = wavelength  frequency
speed 
SI multipliers
Prefix
p
n

m
Multiplier
1  10-12
1  10-9
1  10-6
1  10-3
Prefix
k
M
G
T
Multiplier
1  103
1  106
1  109
1  1012
© WJEC CBAC Ltd.
V
R
distance
time
 100

m
V
vf
GCSE SCIENCE (Double Award) Unit 6 Foundation
Equations
speed 
distance
time
change in velocity
acceleration [or deceleration] 
time
acceleration = gradient of a velocity-time graph
a
v
t
resultant force = mass  acceleration
F = ma
weight = mass  gravitational field strength
W = mg
work = force  distance
W = Fd
force = spring constant  extension
SI multipliers
Prefix
m
k
M
© WJEC CBAC Ltd.
Multiplier
1  10-3
1  103
1  106
F = kx
GCSE SCIENCE (Double Award) Unit 6 Higher
Equations
speed 
distance
time
change in velocity
acceleration [or deceleration] 
time
acceleration = gradient of a velocity-time graph
a
v
t
distance travelled = area under a velocity-time graph
resultant force = mass  acceleration
F = ma
weight = mass  gravitational field strength
W = mg
work = force  distance
W = Fd
kinetic energy =
mass x velocity 2
KE = 12 mv 2
2
change in potential energy = mass  gravitational field strength
 change in height
force = spring constant  extension
PE = mgh
work done in stretching = area under a force-extension graph
W = 12 Fx
SI multipliers
Prefix
p
n

m
Multiplier
1  10-12
1  10-9
1  10-6
1  10-3
Prefix
k
M
G
T
Multiplier
1  103
1  106
1  109
1  1012
© WJEC CBAC Ltd.
F = kx