Electronic Principles
A device that converts thermal energy to electrical energy is called a:

None of these
solar cell
thermocouple
piezoelectric devices
chemical cell

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Electronic Principles
Molecule is

A atom that flows whenever there is an imbalance of electrical charges between two points
A atom that has an excessive number of electrons in its outer orbit
The smallest particle of a substance that retains the properties of that substance
None of these
A atom that has a shortage of electrons in its outer orbit

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Electronic Principles
The core of an electromagnet is said to be in saturation when:

changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
the core is permitted to move freely within the coil
an increase in current through the coil causes no further increase in the mmf
None of these
frequent changes in the direction of current through the coil causes heating effects in the core material

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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
Primary-cell batteries must be recharged at a much slower rate that secondary-cell batteries
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

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Electronic Principles
What is a free electron?

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

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