Physics qs Watch

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lgs98jonee
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#1
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1. A question involving finding the e.m.f. of a cell. You all know the circuit probably. But y is a light bulb put in the circuit???? To check that the circuit works??/ btw, this is two marks!
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XXXNICEGUYXXX
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i have the mark scheme for this question and from wat i remember it was soemthign like

- to act as a fuse in case too much current flows
- not to ruin the ammeter
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lgs98jonee
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any chance that you could scan the markscheme in to the comp??? lots of people would give u rep :-))))
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[_Z_]
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Ive put up the same question.. http://www.uk-learning.net/t43827-4.html .. havent got the right answer... so i could also do with the mark scheme..
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lgs98jonee
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I need help with
q 8 on physics 2 edexel jan 02

it involves fridges and u=q+w


1. how r contents of frideg's temp constant even though energy is flowing from in from outside????

2. explain y w (in equation above) is 0
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[_Z_]
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(Original post by lgs98jonee)
I need help with
q 8 on physics 2 edexel jan 02

it involves fridges and u=q+w


1. how r contents of frideg's temp constant even though energy is flowing from in from outside????

2. explain y w (in equation above) is 0

energy is flowing in... so Q=+ve.... but internal energy is continuously decreasin as the refrigerator is connected to a heat pump....which extracts heat nrg from contents of fridge(thats how a fridge works)..... work is 0 because no work is done by the fridge on the contents .. the heat pump does the work....(if u have nelson thornes:elec and thermal physics... check that... fairly good explanation.)
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