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ALL PHYSICS DOUBTS - POST HERE !!
MasterMath:
can someone verify this for me ? The Advantage of using a CRO over a Voltmeter is because CRO produces more accurate reading as it consumes less curent?
FAST PLEASE :)
Baladya:
http://www.freeexampapers.us/IGCSE/Physics/CIE/2009%20Nov/0625_w09_qp_31.pdf
Q6)b)ii) Why does it stay the same? Isnt it supposed to be constant?
Thanks :)
Ghost Of Highbury:
--- Quote from: MasterMath on May 26, 2010, 06:42:20 pm ---can someone verify this for me ? The Advantage of using a CRO over a Voltmeter is because CRO produces more accurate reading as it consumes less curent?
FAST PLEASE :)
--- End quote ---
yes, by adjusting the time-base and the y-gain, more accurate results.
the_grim_reaper:
--- Quote from: A@di on May 26, 2010, 06:39:39 pm ---Electric shock?
--- End quote ---
Has to be. It was an MCQ in today's paper 1. I did electric shock..
Anyway, I've got just one question today, like you know when we heat something, after we stop, we take the greatest temperature rise. In question 5 (c), November 2008, why are we subtracting 16.3 from 2.1?? I mean will the heater's heat not melt more ice after the it's switched off?? (If this question has been answered, just tell me the page number)
Secondly, say if we're asked to find the latent heat of vaporisation of water, so we calculate the energy given AFTER it reaches the boil right?? Similar in ice like we calculate the amount of heat given AFTER it melts a little??? And like can a joule meter be used in a circuit like say we're using a heater. As soon as the water starts to boil, you switch on the joule meter. Basically, what I want to know is that will current flow through if it is not switched on???? (So we can switch it on at any time and calculate the energy only for that interval??)
Adzel:
--- Quote from: A@di on May 26, 2010, 06:39:39 pm ---Electric shock?
--- End quote ---
yes...
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