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

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

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Electronic Principles
Which one of the following is a direct statement of Ohm's law?

The algebraic sum of currents entering and leaving a point is equal to zero
The algebraic sum of voltages in a loop is equal to zero
None of these
The total resistance of a parallel circuit is less than the value of the smallest resistance
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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Electronic Principles
What is a free electron?

An electron that has been freed from its parent atom
An electron that costs nothing
An electron that has twice the amount of charge of a normal electron
An electron that has no electrical charge
None of these

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