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As I promised last time, I will going to show you the solutions to teasers on our previous topic about the Factors Affecting Resistance here in Electrical Engineering . By the way, this topic is still covered on our review of basic Physics for this is very important one when we reached our major topics in this Electrical Engineering course. Last time, I leaved you four worded problems in order for you to analyze and understand the principles fully. But if you still running out of time to solve it, I will show to you it now. The first problem given was: Problem 1 : The resistance of a copper wire 2, 500 cm long and a 0.090 cm in diameter is 0.67 ohm at 20 degree celcius. What is the resistivity of copper at this temperature? The solution here is quiet simple. We just have to substitute the given values from the formula since we have uniform units: p = RA/ l = 0.67 ohm x [ TT ( 0.090 cm) ^2/ 4 ] / 2, 500 cm     = 1.7 x 10 ^-6 ohm.cm - answer The unit of resistivi...

Let's continue our discussion with our basic concepts here in Electrical Engineering . I guess most of you are familiar with this topic but this should not be neglected because it has a big role during board exam of Electrical Engineering . What is the topic for today? Let's begin.... We all know that Georg Simon Ohm who formulated the law that the resistance of a conductor varies directly with its length, inversely with its cross-sectional area, and depends upon the material of which it is made. From the study of resistors in series, one would expect that the resistance of a piece of uniform wire is directly proportional to its length, since it can be thought of as a series of small pieces of wire whose total resistance is the sum of the resistances of the individual pieces. Let's have an example. Consider a wire 1 ft in length and having a cross- sectional area of 0.3 in^2. By thinking of this as equivalent to three wires ( 1 ft in length) each having a cross-sectional ar...