Electronic Principles
Which one of the following statements is true for the currents in a parallel RC circuit?

The current always has the same amplitude and phase for every part of the circuit
The total current. is greater than the sum of the currents for the resistance and capacitance
The total current is less than the sum of the currents for the resistance and capacitance
The total current is equal to the sum of the currents for the resistance and capacitance
None of these

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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
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
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
Which one of the following is a direct statement of Ohm's law?

The algebraic sum of currents entering and leaving a point is equal to zero
The algebraic sum of voltages in a loop is equal to zero
None of these
The total resistance of a parallel circuit is less than the value of the smallest resistance
The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it

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

None of these
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
has no effect on the current through the inductors

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Electronic Principles
Which one of the following principles best describes the basic operation of an electromagnet?

Current flowing through a conductor generates a magnetic field
Like magnetic poles repel, while unlike poles attract
None of these
Current is induced in a conductor that is moving through a magnetic field
Like magnetic poles attract, while unlike poles repel

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