Equations Flashcards by Jonny Billinton | Brainscape

Q

Pressure?

A

Force / area

P = F/A

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Q

Distance travelled?

A

Speed x time

S = v t

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Q

Acceleration?

A

Change in velocity / time taken

a = v - u / t

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Q

Wave speed?

A

Frequency x wavelength

V = f a

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Q

Charge?

A

Current x time

Q = I t

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Q

Potential difference?

A

Current x resistance

V = I R

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Q

Electrical Power (1)?

A

Potential difference x current

P = V I

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Q

Power (2)?

A

(Current²) x resistance

P = I²R

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Q

General power?

A

Energy transferred / time

P = E/t

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Q

Energy transferred?

A

Charge x potential difference

E = Q V

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Q

Density?

A

Mass / volume

rho = m/v

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Q

Period?

A

1 / frequency

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Q

Boyle’s Law?

A

pV = constant

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Q

Newton’s 2nd Law?

A

Acceleration = force / mass

a = F / m

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Q

Weight?

A

Mass x gravitational field strength

w = m g

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Q

Work done?

A

Force x distance moved

W = F D

Q

Hooke’s law?

A

Force = spring constant x spring extension

F = k e

Q

Resistance?

A

Potential difference / Current

R = V/I

Q

Efficiency?

A

Useful energy / Energy put in x100

E= useful/input x100

Q

Kinetic energy?

A

1/2 x Mass x Speed²

Ek=1/2mv²

Q

Gravitational potential energy?

A

Mass x Gravitational field strength x Height

Ep=mgh

Q

Velocity²?

A

Initial velocity² + 2 x Acceleration x Displacement

v²=u²+2as

Q

Elastic potential energy?

A

1/2 x Spring constant x Extension²

Ee=1/2ke²

Q

Specific heat capacity?

A

Energy / mass x temperature change

c = E / m x temp.

Q

Specific latent heat?

A

Energy / mass

l = E / m

Q

Pay back time?

A

Cost of insulation / Annual saving

Q

No. of units used?

A

Power x Time

Pt

Q

Total cost of electricity?

A

No. of units used x Unit price

Q

Transformer?

A

Np/Ns = Vp/Vs

Q

Moments?

A

M = F x d

Q

Pressure at a certain depth due to the column of liquid above?

A

Pressure = depth x field strength x density

p=hρg

Q

Momentum?

A

Mass x Velocity

m = m x v

Q

Force (in terms of momentum)?

A

Change in momentum / time taken

F = ΔP / Δt