Electronic Principles
What is the difference between the kinds of charges for an electron and a proton?

An electron has a positive charge and a proton has a negative charge
An electron has a negative charge and a proton has no charge
None of these
An electron has a negative charge and a proton has a positive charge
An electron has a positive charge and a proton has no charge

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Electronic Principles
One henry of inductance is defined as:

the amount of inductance required for generating 1 V of counter emf when the current changes at the rate of 1 A per second
the amount of inductance required to change the frequency of a current by 1 Hz
None of these
the number of turns of wire in an inductor multiplied by the amount of current flowing through it
the amount of counter emf required to reduce a current to 1 A

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

Primary-cell batteries must be recharged at a much slower rate that 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 use chemical cells, whereas secondary-cell batteries use an alternative energy source, such as thermal or magnetic energy, to supplement their outputs
Secondary-cell batteries can be recharged and used many times, whereas primary-cell batteries cannot be properly recharged

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