Imagine yourself to be an employee working in the power management department of a company, you are sitting in a control room which consists of various meters end instruments for measuring all the parameters of electricity. Assume that there are only 10 units (alternators) operating under your supervision. Now suppose there is a loadshedding or a power cut in your locality, you are not allowed to leave your room. Then what parameter of electricity should you note so that you understand that a loadshedding has taken place?
(All conditions are normal in the control room).