# Physical Science

If a step-up transformer has a primary coil with 40 turns, how many turns would be required in the secondary coil in order to increase the voltage from 80 volts to 160 volts?

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1. twice the voltage means twice the turns

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2. N1 = # of turns on primary.
N2 = # of turns on secondary.

N1/N2 = V1/V2.
40/N2 = 80/160.
N2 = ?

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