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The essential difference between an $AC$ generator and a $DC$ generator is that :

• A
  $AC$ generator has an electromagnet while a $DC$ generator has permanent magnet.
• B
  $C$ generator will generate a higher voltage.
• C
  $AC$ generator will generate a higher voltage.
• ✓
  $AC$ generator has slip rings while the $DC$ generator has a commutator.