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
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 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

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

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

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