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You measure voltage using a voltmeter which involves measuring the electrical potential difference between 2 points in an electrical circuit.
Electrical engineering deals with electrical lines, transformers, circuit breakers, power transmission , generation and distribution. Instrumentation engineering is a sub branch of electrical engg. but we can say that Instrumentation engg. is mixture of electrical, mechanical(somewhat), electronics, computer(somehow)..... Instrumentation deals with sensors, transducers, analog and digital controllers, automation etc... so main difference between Instru and Electrical is, Instru. for making plant Automatic and electrical for making plant powered with electricity ....
Electrical is an one type of energy ie flow of electrons... this flow of electrons constitutes the Electricity which we are using for our use