NEED HELP!!!!

[khizar]

Can someone explain me current electricity of As level because i cant solve many past paper questions on it especially
N o8 qs 7. kindly provide any link if possible for under standing this topic relevantly to my syllabus.....;(

 

[Zohaib Sherazi]

Try this http://www.s-cool.co.uk/alevel/physics.html

 

[princesszahra]

The Wheatstone Bridge is designed to enable the calculation of unknown resistances. It is very accurate, and works on reducing the potential difference or current between A and B to zero. It is much easier and more accurate to change the variable resistorand estimate when the current is zero than to measure the voltage across a resistor, the current though a resistor then use the equation V=IR

Having obtained a zero reading on the resistor, the unknown resistance R_x could then be calculated because R2 and R3 are in the same ratio as R1 and Rcx hence
R1/R3 =R1/Rx



We rearrange this to make Rx the subject
any specific topic??????



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[khizar]

thanks!!! alot .

 

[Refining Heaven DV]

yes