Electronic Principles
Current and voltage are said to be in phase when:

All of these
their waveforms are both ac or both dc
None of these
their waveforms cross through zero and reach positive and negative peaks at the same time
they have the same amplitude and frequency

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Electronic Principles
Doubling the operating frequency of a purely inductive circuit:

increases the current, but by an amount that can be determined only by doing a complete analysis of the circuit
cuts the current through the inductors one-half
doubles the amount of current through the inductors
None of these
has no effect on the current through the inductors

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Electronic Principles
Which one of the following is a statement of KirchhofFs voltage law?

None of these
The algebraic sum of voltages entering and leaving a point is equal to zero
The total voltage in a parallel circuit is less than the value of the smallest voltage
The algebraic sum of voltages in a loop is equal to zero
The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it

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