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

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
None of these
Primary-cell batteries can be recharged and used many times, whereas secondary-cell batteries cannot be properly recharged
Secondary-cell batteries can be recharged and used many times, whereas primary-cell batteries cannot be properly recharged
Primary-cell batteries must be recharged at a much slower rate that secondary-cell batteries

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Electronic Principles
Which one of the following statements is true for the impedance of a series RC circuit?

The impedance is equal to the sum of the resistance and capacitive reactance
The impedance is less than the sum of the resistance and capacitive reactance
None of these
The impedance is greater than the sum of the resistance and capacitive reactance
The impedance is greater than either the resistance or capacitive reactance but less than their sum

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Electronic Principles
Which one of the following phrasers best describes flux density?

None of these
The force that maintains lines of force
The rate of change of the number of lines of magnetic force
The concentration of lines of magnetic force
The opposition to a build-up of magnetic fields

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