Electronic Principles
What form of energy is used for creating static electricity?

Mechanical energy
Solar energy
Chemical energy
None of these
Light energy

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

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

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Electronic Principles
In a pure inductor:

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

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