30. Induction and Inductance
Transformers
Multiple Choice
Multiple ChoiceAn outlet in North America outputs electricity at 120 V, but a typical laptop needs to operate at around 20 V. In order to do so, a transformer is placed in a laptop's power supply. If the coil in the circuit connected to the laptop has 20 turns, how many turns must the coil in the circuit with the outlet have?
A
3 turns
B
6 turns
C
20 turns
D
120 turns
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