formulas igcse

Question 1

FORM: Power (2 types)

Answer 1

P= voltage^2 / resistance . P= work done/time. (watts(w))

Question 2

FORM: weight

Answer 2

Weight= Mass X Gravitational f

Question 3

FORM: Workdone

Answer 3

workdone= Force X Distance (J)

Question 4

FORM: frequency of light wave

Answer 4

speed of light / wave length

Question 5

Form: charge

Answer 5

charge= current x time (Coulombos)

Question 6

FORM: energy

Answer 6

voltage X current X time (J)

Question 7

FORM: current

Answer 7

power / voltage. (Amps(A))

Question 8

FORM: kinetic energy

Answer 8

(1/2) X mass X velocity^2

Question 9

FORM:acceleration

Answer 9

=Δv/Δt (m/s^2) Δ= difference

Question 10

FORM: moment

Answer 10

force × perpendicular distance from the pivot

Question 11

FORM: force

Answer 11

force= acceleration X mass

Question 12

state hooke’s law

Answer 12

force needed to extend or compress a spring by some distance (x) scales linearly with respect to that distance

Question 13

FORM: voltage

Answer 13

voltage= resistance X current

Question 14

FROM: (Hooke’s law)

Answer 14

Force = constant x extension

Question 15

form: density

Answer 15

mass / volume

Question 16

form: Potential Energy

Answer 16

Potential Energy = mass x gravity x height (GPE = mgΔh)

Question 17

form: pressure

Answer 17

force / area. (Pascals (Pa)

Question 18

form: potential difference (Voltage) =

Answer 18

Work done /Charge

Question 19

form : e.m.f.

Answer 19

= Energy supplied /Charge

Question 20

form : Efficiency

Answer 20

= useful Energy(or power) output/
Energy(or power) input. X 100%

Question 21

form: Frequency wave

Answer 21

number of oscillations /
Time taken

Question 22

form : Refractive index n

Answer 22

= sin i/
sin r

Question 23

form : transformers coil

Answer 23

Number of turns in primary coil /
Number of turns in secondary coil= Voltage in primary coil/ Voltage in secondary coil