Electronic Principles
A typical light switch in your home is a:

toggle switch
None of these
rotary switch
momentary push button switch
knife switch

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Electronic Principles
Which one of the following phrases best describes residual magnetism?

Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
None of these
The amount of magnetic flux that is not confined to the core material of an electromagnet
The circular magnetic field that surrounds a conductor carrying a current
The force of attraction between the poles of a permanent and temporary magnetic field

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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
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
Primary-cell batteries must be recharged at a much slower rate that secondary-cell batteries
None of these

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