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Question 1

Ohm’s Law for Circuits
V

Answer 1

V = IR
V Voltage Volt
I Current Amps
R Resistance Ohm

Question 2

Effective Resistance
Parallel Circuit
Reff

Answer 2

Reff= (1/R1 + 1/R2 + 1/R3…)^-1

Question 3

Effective Resistance Series Circuit
Reff

Answer 3

Reff= R1+R2+R3

Question 4

Electric Power
P

Answer 4

P = VI = R(I)^2
P Power
V Voltage Volts
I Current Amps

Question 5

Kinetic Energy
Ek

Answer 5

Ek= 1/2 * m * v^2
Ek Kinetic Energy
m mass Kg
v velocity m/s

Question 6

Gravitational Energy
Eg

Answer 6

Eg = mgh
Eg Gravitational energy
m mass kg
g gravity -9.8m/s^2
h vertical height (height above sea level m)

Question 7

Work Energy
W

Answer 7

W = Fs
W work J
F force
s displacement

Question 8

Newton’s Second Law
F

Answer 8

(sum of) F = ma
F force
m mass kg
a acceleration m/s^2

Question 9

Torque
T

Answer 9

T = Fr
T Torque
F Force
r perpendicular radius

Question 10

Gas Law

Answer 10

PV = nRT
P pressure atm
V volume L
n moles
R gas constant
T temperature Kelvin

Question 11

Density
p

Answer 11

p = m/v
p density g/cm^3 or kg/m^3
m mass
v volume

Question 12

Pressure
p

Answer 12

P= F/A
P pressure
F force applied
A Area

Question 13

Momentum
P

Answer 13

P = mv
P momentum
m mass kg
v velocity m/s

Question 14

Wave Theory
Frequency
F

Answer 14

f = 1/T
f frequency Hz λ/sec
T period of wave (s) - time take for WL to pass through

OR

f = no. cycles/Time

Question 15

Wave Theory
Velocity
V

Answer 15

V = fλ
V velocity m/s
f frequency Hz
λ wavelength (m)

Question 16

Rate of Change

Answer 16

(y2-y1)/(x2-x1)

Question 17

Gradient m

Answer 17

m = (y2-y1)/(x2-x1)
y= mx + c

Question 18

Average Speed
s

Answer 18

s= total distance/time

Question 19

Average Velocity

Answer 19

(u+v)/2
or
(x2-x1)/(t2-t1)
change in x/change in t
change in displacement/change in time

Question 20

Average Acceleration

Answer 20

v-u/t
change in v / change in t

Question 21

E cell potential

Answer 21

E cell = E red + E ox

Question 22

Gibbs’ Free Energy
ΔG

Answer 22

ΔG = ΔH- TΔS
ΔG change in Gibbs Free Energy
ΔH change in enthalpy
ΔS change in entropy
T temperature K

Question 23

Air Optical Density Refraction

Answer 23

n = 1.0
where

if n2>n1, θr < θi
if n2<n1, θr>θi

Question 24

Dimensional analysis

Answer 24

P = f/a.
f = ma
v = s/t
a = s/t^2
q = it (charge = current x time)
w = fs (use this for energy)