Electronic Principles
Assuming 100% efficiency, what is the power being applied to the primary winding of the transformer described in the above question?

100 W
20 W
200 W
1000 W
None of these

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Electronic Principles
In a pure inductor:

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

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Electronic Principles
Which one of the following statements is true for the voltages in a series RL circuit?

None of these
The total voltage lags the total current by less than 90
The total voltages is equal to the sum of the voltages across the resistance and inductance
The total voltage is less than the sum of the voltages across the resistance and inductance
The voltage always has the same amplitude and phase for every part of the circuit

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