Equations

Question 1

V = I x R

Answer 1

Voltage (potential difference) = Current x Resistance

Question 2

P = I x V

Answer 2

Power = Current x Voltage (potential difference)

Question 3

P = I x I x R or P = I²R

Answer 3

Power = Current squared x Resistance

Question 4

E = P x t

Answer 4

Energy = Power x Time

Question 5

KE = ½mv²

Answer 5

Kenetic energy = half x Mass x Velocity squared

Question 6

PE = m x g x h

Answer 6

Potential energy = Mass x Gravitational field stretch x Height

Question 7

Equation for efficiency

Answer 7

Efficiency = Useful output divided by (over) Total input

Question 8

Q = I x t

Answer 8

Charge = Current x time

Question 9

E = Q x V

Answer 9

Energy = Charge x Voltage (potential difference)

Question 10

D = m / v

Answer 10

Density = Mass / Volume

Question 11

W = m x g

Answer 11

Weight = Mass x Gravitational field strength

Question 12

WD = F x d

Answer 12

Work done (energy transferred) = Force x Distance

Question 13

F = m x a

Answer 13

Force = Mass x Acceleration

Question 14

p = m x v

Answer 14

Momentum = Mass x Velocity

Question 15

What is the wave speed equation

Answer 15

Wave speed = Wavelength x frequency

Question 16

a = v-u / t

Answer 16

Acceleration = Change in speed / time taken

Question 17

F = k x e

Answer 17

Force = Spring constant x Extension

Question 18

p = F/A

Answer 18

pressure = force/ area

Question 19

s = v t

Answer 19

distance = speed x times

Question 20

M = F d

Answer 20

moment = force x distance

Question 21

P = W/ t

Answer 21

power = workdone / time = energy / time