paper 1 : equations

Question 1

how do you calculate kinetic energy

Answer 1

kinetic energy = 0.5 x mass x (speed)^2

(Ek = 0.5mv)^2

Question 2

how do you calculate gravitational potential energy

Answer 2

gravitational potential energy = mass x gravitational field strength x height
(Ep = mgh)

Question 3

how do you calculate power

Answer 3

power = energy transferred / time (P=E/t)
OR
power = work done / time (P=W/t)

Question 4

how do you calculate efficiency

Answer 4

efficiency = useful energy output/ total energy input
OR
efficiency = useful power output/ total power input

Question 5

how do you calculate charge flow

Answer 5

charge flow = current x time (Q=It)

Question 6

how do you calculate potential difference

Answer 6

potential difference = current x resistance (V=IR)

Question 7

how do you calculate electrical power

Answer 7

power = potential difference x current (P=VI)
OR
power = (current)^2 x resistance (P=I^2R)

Question 8

how do you calculate energy transferred

Answer 8

energy transferred = power x time(E=Pt)
OR
energy transferred = charge flow x potential difference (E=QV)

Question 9

how do you calculate density

Answer 9

density = mass / volume

Question 10

how do you calculate pressure in gases

Answer 10

pressure x volume =constant (pV=constant)