Foundation Equations

Question 1

P = V x I

Answer 1

Power = Voltage x Current

Watts Volts Amps

Question 2

V = I x R

Answer 2

Voltage = Current x Resistance

Volts amps ohms

Question 3

Total cost

Answer 3

Number of units x cost per unit

Question 4

Efficiency (%)

Answer 4

(Useful energy out divided by total energy in) x 100

Question 5

GPE = mgh

Answer 5

Gravitational Potention Energy = mass x gravity x height

Joules kg Newtons Metres

Question 6

KE = 1/2 mv2

Answer 6

Kinetic energy = 0.5 x mass x velocity2

Joules Kg

Question 7

W = F x d

Answer 7

Work done = Force x distance

Joules Newtons Metres

Question 8

W = E

Answer 8

Work done = Force x distance

Joules Newtons Metres

Question 9

P = E divide t

Answer 9

Power = energy divide time

Watts Seconds

Question 10

S = d divide t

Answer 10

Speed = distance divide by time

Metres p second Metres Seconds

Question 11

a = (v-u) divide by t

Answer 11

acceleration = change in velocity ÷ time.

M/s(2) Seconds

Question 12

W = m x g

Answer 12

weight = mass x gravity.

Newtons Kg Newtons

Question 13

V = f x λ

Answer 13

wave speed = frequency x wavelength

M/s Metres

Question 14

F = k x e

Answer 14

Force applied = spring constant x extension

Newtons Newtons p metre Metres