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Physics for IGCSE & O level - Magnets And Currents (Section 5 - No. 3)

Which of the following are reasons why a.c. is used for the mains?
It can be generated more efficiently than 'one-way' direct current (d.c.)
It is more effective
It can be stepped up and down using transformers
It can be used for high voltages

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A.C. can be generated more efficiently and stepped up/down via transformers.

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