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Hereof, what is difference between voltmeter and Voltameter?

Voltameter is an electrolytic cell and is used to carry out the process of electrolysis but voltmeter is an instrument used for measuring the potential difference across two points in a circuit . It is always connected in parallel across the desired points i8n an electrical circuit.

Also Know, who invented Voltameter? August Wilhelm von Hofmann

Likewise, what do you mean by electrodes?

An electrode is an electrical conductor used to make contact with a nonmetallic part of a circuit (e.g. a semiconductor, an electrolyte, a vacuum or air).

What is the SI unit of voltmeter?

The standard unit of electric field (E-field) strength is the volt per meter (V/m). An E field of 1 V/m is represented by a potential difference of 1 V existing between two points that are 1 m apart. Reduced to base SI units, 1 V/m is the equivalent of one meter kilogram per second cubed per ampere. hope it helps..☺