2011- 4- 22
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#3
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مشرفة سابقة
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رد: الفيزيا : هوموورك 2
عرفت بقية الاسئله ..  بعد التمعن فيها
1- Formula : Power= current x voltage
power=2x10
20watts
2- Where an object has excess electrons, the object is negatively charged. Where there is a deficiency of electrons, the object is positively charged
3- Solids are rigid because their molecules do not have enough kinetic energy to go anywhere-they just vibrate in place
4- when double both voltage and resistance CURRENT STAYS THE SAME
CURRENT I1 = V1/R1
SO IF MAKE V2 = 2V1 AND R2 = 2R1
CURRENT I2 = V2/R2 = 2V1/2R1 = V1/R1
SAME thing as I1
now if double only the voltage
I is proportional to V
I is inversely proportional to R
when double V then I doubles also.
I1 = V1/R1
V2 = 2V1
I2 = V2/R1 = 2V1/R1 then I2 = 2(I1)
and this is the same result as the voltage and resistance NOT being doubled. Hence, the current will remain the same
5- Parallel, in series the resistance is cumulative
*وبس خلصنا تكفيني دعواتك لي
موفقه .. 
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