When an ideal current controlled source only belong to one mesh, the current of this mesh equal to the output of the current source and its general mesh equation should not be listed.
正确
举一反三
- If the current direction of each mesh is the same, the mutual resistance of each mesh equation ( ). A: is always negative B: is always positive C: is always zero D: can be positive or negative
- Which one does not belong to the advantages of power electronic devices? A: When the device turns off, it can withstand high terminal voltage and the leakage current is approximately zero B: When the device turns on, it can carry a large current, and the terminal voltage is approximately zero C: The device can work in amplified state D: The current can only flow through in one direction
- Jacob has a bank loan, which is repayable in equal instalments over the next four years.How should this be presented in his statement of financial position? A: As a non-current liability only B: As a current liability only C: As a non-current liability only, but with an explanation in the notes to the accounts that some is expected to be paid within the current year D: Split between current liabilities and non-current liabilities
- The inductor voltage phase lags its current by 90 o, and the capacitor current lags its voltage by 90 o, is this conclusion true? [ ]. A: It's impossible. B: When the capacitance and inductance are nonlinear components. C: When inductance current and voltage, capacitance current and voltage are not related direction. D: Whenever.
- ______ allows<br/>us to convert a practical voltage source into a practical current<br/>source , and vice versa.
内容
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A transistor is a current controlled device
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belong to current assets.
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The no-load character of a 3-phase synchronous generator is the relationship between ( ). A: no-load emf Eo; exciting current If B: output<br/>voltage U; load current I C: output current I; exciting current If D: no-load<br/>emf Eo; load current I
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What is the source of static magnetic field? A: static charge B: steady current C: time-varing current D: the other three answer are all right.
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Two electronic devices are connected in series. When the load device wants to get the maximum ( ), the impedance of that is the same as the output impedance of the source (front-stage) device. A: Current B: Voltage C: Resistance D: Electric power