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questions regarding basic electric circuits?
1)why does the measured value of a resistor deviate from its theoretical value(determined from color codes)?please list the factors.
2)there is a lot of confusion over the power absorption and generation of any circuit element..how would we know that a particular instant the current is entering the element from the + end?? an instant can be interpreted in 2 different ways..at the same time a current seems to leave and enter the positive end.. and this confusion leads to sign differences(absorption and generation concept)..
.where can i get circuit problems with their solutions apart from the text books..does any one have quizzes,tests and exam papers ??
1. Resistors are color coded using a system called Preferred values. The EIA “E” series specify the preferred values for various tolerances.
E3 50% tolerance (no longer used),
E6 20% tolerance (now seldom used),
E12 10% tolerance,
E24 5% tolerance (and usually 2% tolerance),
E48 2% tolerance (also for inventory cost control in place of E96),
E96 1% tolerance,
E192 0.5, 0.25, 0.1% and higher tolerances.
As such, there would be some deviations from the given values within the tolerance value.
2. Kirchhoff’s Current Law
At any instant the sum of all the currents flowing into any circuit node is equal to the sum of all the currents flowing out of that node:
Sum I_in = Sum I_out
Similarly, at any instant the algebraic sum of all the currents at any circuit node is zero:
Sum I = 0
3. Go to this site for a tutorial:
http://www.eas.asu.edu/~holbert/ece201/kvl.html
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