Final answer:
The passive voice sentence 'The faulty wiring was mended by an electrician' is rewritten in the active voice and simple past tense as 'An electrician mended the faulty wiring.'
Step-by-step explanation:
The sentence 'The faulty wiring was mended by an electrician' can be rewritten in active voice using simple past tense as: 'An electrician mended the faulty wiring.' In this active voice construction, 'an electrician' becomes the subject who performs the action, which is 'mended,' on the object, which is 'the faulty wiring.' Using active voice verbs like this makes the sentence stronger, clearer, and more concise.