Equations

Question 1

Charge Flow

Answer 1

Charge flow = current x time Q=IT

Question 2

Power

Answer 2

Power = (current)^2 x resistance P=(I)^2R

Question 3

Energy transferred

Answer 3

Energy transferred = charge flow x potential difference E=QV

Question 4

Power

Answer 4

Power = current x potential difference P=IV

Question 5

Potential difference

Answer 5

Potential difference = current x resistance V=IR

Question 6

Kinetic energy

Answer 6

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

Question 7

Efficiency

Answer 7

Efficiency = useful output/total power output

Question 8

Power

Answer 8

Power = energy transferred/time P=Et

Question 9

Density

Answer 9

Density = mass/volume ρ=m/v

Question 10

Potential energy

Answer 10

Potential energy = current x resistance V=IR

Question 11

Weight

Answer 11

Weight = mass x gravitational field strength W=mg

Question 12

Work done

Answer 12

Work done = force x distance moved W=Fd

Question 13

Force

Answer 13

Force = spring constant x extension F=ke

Question 14

Distance

Answer 14

Distance = speed x time D=st

Question 15

Acceleration

Answer 15

Acceleration = (final velocity - initial velocity)/time taken a=(v-u)/t

Question 16

Force

Answer 16

Force = mass x acceleration F=ma

Question 17

Wave speed

Answer 17

Wave speed = frequency x wavelength v=f λ

Question 18

Power

Answer 18

Power = energy transferred/time P=Et

Question 19

Momentum

Answer 19

Momentum = mass x velocity p=mv

Question 20

Moment

Answer 20

Moment = force x perpendicular distance M=Fd

Question 21

Pressure

Answer 21

Pressure = force/area P=F/a