Electronic Principles
A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current?

300 mA
200 mA
208 mA
7.8 mA
None of these

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Electronic Principles
For a pure capacitor:

ac current lags the voltage by 90 degree
ac current leads the voltage by 90 degree
ac current is converted to dc voltage
ac current and voltage are exactly in phase
None of these

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