Electronic Principles
If a load resistance is 1 kW, a stiff current source has a resistance of

Less than 10 Ohm
More than 100 k Ohm
At least 10 Ohm
None of these
Less than 100 k Ohm

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

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

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Electronic Principles
Voltage is

The smallest electrically charged particle
The flow of charged particles through a material
None of these
The number of free electrons in an atom
Trie force that causes electrons to flow

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