Electronic Principles
What is the primary difference between primary and secondary cell batteries?

Primary-cell batteries can be recharged and used many times, whereas secondary-cell batteries cannot be properly recharged
None of these
Primary-cell batteries must be recharged at a much slower rate that secondary-cell batteries
Secondary-cell batteries can be recharged and used many times, whereas primary-cell batteries cannot be properly recharged
Primary-cell batteries use chemical cells, whereas secondary-cell batteries use an alternative energy source, such as thermal or magnetic energy, to supplement their outputs

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Electronic Principles
In a pure inductor:

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

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Electronic Principles
Which one of the following is a statement of Kirchhoffs current law?

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

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