equations Flashcards by b m

Q

Power

A

current X voltage

P = IV

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Q

voltage

A

current X resistance

V = IR

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Q

charge

A

current X time

Q = It

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Q

energy transfered

A

charge X voltage

E = VQ

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Q

wave speed

A

freq. X wavelength

v = f λ

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Q

refractive index

A

n = sin(i) / sin(r)

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Q

critical angle

A

sin(C) = 1/n

sin(critical angle) = 1/ refractive index

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Q

efficiency

A

useful energy output/ total energy input

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Q

work done

A

force X distance moved

W = Fd

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Q

gravitational potential energy

A

mass X gravitational field strength X height

GPE = mgh

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Q

kinetic energy

A

1/2 X mass X speed^2

KE = 1/2mv^2

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Q

speed

A

distance / time

s = d/t

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Q

acceleration

A

change in velocity / time taken

a = (v-u)/t

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Q

weight

A

mass x gravitational field strength

W = mg

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