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# Physics P1 AQA Watch

1. E (J) = m (kg) × c (J/kg) × θ (degrees c)

efficiency (J) = useful energy out / total energy in (× 100%)

efficiency (J)= useful power outtotal power in (× 100%)

E (J) = P(W) × t (s)

v (m/s) = f(Hz) × λ(m)

Payback time = cost of installation / saving per year (£)

kwH = kw x hour

cost (£) = kwh x price per unit (P)
2. (Original post by z_o_e)
Like this?

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Yep, I think that looks OK.
3. (Original post by LNDNWASPS)
x
(Original post by PrinceKian)
x
(Original post by TheOtherSide.)
x
(Original post by _Xenon_)
x
(Original post by glassriver)
x
I've got that we need to know payback time and the kilowatt hours equation
4. What could I say for the second bit?
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5. (Original post by z_o_e)
What could I say for the second bit?
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It dissipates into surroundings.
6. Thanks that was a big help
7. (Original post by TheOtherSide.)
It dissipates into surroundings.
Thank you xx

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8. Hi the main thread can be found here
http://www.thestudentroom.co.uk/show...4111921&page=1

Best of luck for tomorrow!

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Updated: May 25, 2016
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