IGCSE Formula Flashcards
Average Speed** (s)** =
Total Distance (d)
Total Time **(t)**
** **
Damn Silly Triangle
Acceleration **(a) **=
change in velocity** (v-u) **
time taken (t)
Hooke’s Law: Force F =
** k × x**
spring constant × extension
** **(Only up to the limit of proportionality)
Resultant Force F =
m × a
mass × accleration
Weight W =
m × g
mass × graviational field strength
Wallace meets Gromit
g (on Earth) =
10m/s² or 10N/kg
Density ρ =
mass (m)
volume (V)
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Gravitatonal Potential Energy GPE =
m × g × h
mass × gravitational field strength × height change
Kinetic Energy KE =
½ × m × v²
½ × mass × speed²
Efficiency =
Useful Energy Output
Total Energy Input
Work Done W =
= F × d
Force × distance moved in direction of force
or Energy Transferred
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Power P =
Energy Transferred (E)
Time Taken (t)
Elephants Play Trumpets
Remember Work Done = Energy Transferred
Pressure (P) =
Force (F)
Area (A)
Fat Aunty Pat
Boyles Law
Pressure × Volume =
P1 × V1 =
Consant
P2 × V2
Heat energy supplied to change state E =
** l x m**
Specific Latent Heat x mass
Heat energy supplied to raise the temperature E =
**m × c × Δθ **
or** m × c × (θ2-θ1)**
= mass × specific heat capacity × rise in temperature
Current I** =**
Charge (Q)
Time (t)
Current is the rate of flow of charge
Quiche Is Tasty
Potential Difference / Voltage V =
Energy E
Charge Q
Potential difference is the energy transferred per Coloumb of charge
Evil Queen Victoria
Resistance R =
Voltage V
Current I
Very Important Rule
Electrical Power P =
I × V
Current × Voltage
Power Is Vicious
Electrical Energy Transferred E =
P × t
Power × Time
or
** I × V × t**
Current × Voltage × time
Transformers:
Vp =
V<strong>s </strong>.
p.d across primary coil
p.d across secondary coil
Np
Ns
number of turns in primary coil
number of turns in secondary coil
Transformers
Vp × Ip=
Power In =
Vs × Is
Power Out
(if 100% efficient)
Resistors in series
RTotal =
R1 + R2 + …
Resistors in Parallel
_ 1 _ =
RTotal
1 + 1 + …
R1 R2 .
Frequency f =
_ 1 _
Period (time for 1 cycle)
** _ 1 _ **
T
Wavespeed v =
f × λ
frequency × Wavelength
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Frequency =
Number of waves
TimeTaken
