Physics 2 Final - Part 1 of 2
SAMPLE
Please be aware that you practice a sample exam set, which means that it’s mimicking a real exam. In order to have more accurate experience:
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30. Induction and Inductance / Transformers / Problem 6
A laptop charger needs to convert 230 V from a wall outlet to 9.0 V to charge the laptop battery safely. If the charger is rated at 20 W (i) determine the current in the primary coil of the charger's transformer (ii) calculate the resistance of the charging element.
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