All Equations

Question 1

Change in thermal energy=

Answer 1

Change up thermal energy(J) =mass(kg) x specific heat capacity(kg/j°C) x temp change(ºC)

Question 2

Efficiency=

Answer 2

Efficiency = useful power output / total power input

Efficiency = useful output energy transfer / total input energy transfer

Question 3

Charge=

Answer 3

Charge(C) = current(A) x time(s)

Question 4

Potential difference=

Answer 4

Potential difference(V) = current(A) x resistance(ohms)

Question 5

Power=

Answer 5

Power = work done(j)/ time(s)

Power= energy transferred(j) / time(s)

Question 5

Kinetic energy=

Answer 5

0.5 x mass , speed-squared

Question 6

GPE=

Answer 6

GPE= mass x gravitational field strength x height

Question 7

Elastic potential energy =

Answer 7

EPE= 0.5 x spring constant x extension-squared

Question 8

Power=

Answer 8

Power= current x PD

Power= current-squared x resistance

Question 9

Energy transferred

Answer 9

Energy transferred= power x time

Energy transferred= charge x P.D

Question 10

Density =

Answer 10

Density = mass / volume

Question 11

Thermal energy

Answer 11

Thermal energy = mass x specific latent heating

Question 12

Wave speed

Answer 12

Eave speed = frequency x wavelength

Question 13

Weight

Answer 13

Weight = mass x gravitational field strength

Question 14

Work done

Answer 14

Work done = force x distance