Consider sine waves for. e.g sin 120+240j (sin A+Dj) where. A  magnitude. D  angle or radians. j  sqrt (1) then draw the 2 dimensional graph. by using the above conditions. For
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You might look here. http://mysite.du.edu/~jcalvert/tech/tran….
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The formula you have is for charging an inductor through a resistance, due to a change in voltage. It can be used to predict the voltage on the inductor given the rate of change in
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phasors are used (complex algebra) in circuit analysis and such, where the significance is in resolving the loop/branch currents/voltages. vector diagrams are used (graphical) to
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