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Thank you for the reply! I understood the phasor diagrams but the one question that remains is , how do you know if the load is capacitive or inductive in the mentioned problem? I do not see any info on type of load.

There is a question on the CI tests question 48:  Why is there a negative sign in the formula? and XL is inductive!

I thought it's the other way round? plus for leading and minus for lagging?

Hi, The equation for voltage drop is I*L/1000[ R*cos(theta) + X*sin(theta)]. But I am confused on when to use the plus or minus sign in between the resistance and reactance?  Different problems in CI show different approaches. Someone please help!

Thank u!

Hi, I am contemplating on purchasing the NESC 2017 book. Do I really need it since it is $200 ? But I think my company would pay for it.