Equations

Question 1

Kinetic energy =

Answer 1

Kinetic energy - 0.5 x mass x velocity^2 (Ek= 1/2 m v^2)

Question 2

Gravitation potential energy=

Answer 2

Gravitation potential energy= Mass x gravitational field strength(9.8/10) x height (Ep= m g h)

Question 3

links energy and time

Power =

Answer 3

Power = Energy transferred / time (P = E/t)

Question 4

Power =
(Work done version)

Answer 4

Power = Work done / time (P = W/t)

Question 5

potential difference and current version

Power =

Answer 5

power = potential difference × current (P= IV)

Question 6

current amd resistance version

Power =

Answer 6

power = (current)^2 × resistance
(P = I^2 R)

Question 7

Potential difference =

Answer 7

potential difference = current × resistance (V = IR)

Question 8

energy

Efficiency =

Answer 8

Efficiency = useful output energy transfer / total input energy transfer

Question 9

power version

Efficiency =

Answer 9

Efficiency = useful power output / total power input

Question 10

Charge flow =
(Current and time)

Answer 10

charge (C/ coulombs) = current × time (Q=It)

Question 11

power version

Energy transferred =

Answer 11

energy transferred = power × time (E = P t)

Question 12

charge flow adn pd version

Energy transferred =

Answer 12

energy transferred = charge flow × potential difference
E = Q V

Question 13

Work done =

Answer 13

work done = force × distance (along the line of action of the force)
W = F s

Question 14

weight =

Answer 14

weight(N) = mass (kg) x gravitational field strength (N/kg)

Question 15

acceleration

Answer 15

a = v - u / t

Question 16

constant acceleration

Answer 16

v^2 - u^2 = 2as