In which of the following appUcations, direct current is absolutely essential ?
Correct answer: B. Electrolysis
- A. Illumination
- B. Electrolysis
- C. Variable speed operation
- D. Traction
Explanation
Electrolysis requires a unidirectional flow of current so that ions consistently move toward their respective electrodes and chemical reactions remain one-way. AC would repeatedly reverse the electrode polarities, so it is unsuitable for ordinary electrolysis.
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