举一反三
- The value of drain current is always （ ） the value of the short circuit drain current IDSS for a given JFET.
- The resistance value is infinite, the current passing through the resistance is always zero, and the voltage depends on the external circuit, then it is called as the short circuit state.
- A circuit may be defined as a path for current flow. 前后两个下划线介词短语分别充当_______。
- A closed path followed by main magnetic flux is known as a ( ). A: Magnetic circuit B: Electric circuit C: Magnetic saturation circuit D: None of the above
- Which of the following statements is FALSE? A: Finding the present value and compounding are the same. B: A dollar today and a dollar in one year are not equivalent. C: If you want to compare or combine cash flows that occur at different points in time, you first need to convert the cash flows into the same units or move them to the same point in time. D: The equivalent value of two cash flows at two different points in time is sometimes referred to as the time value of money.
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【单选题】The types of short-circuit in three-phase system are three-phase short-circuit, two-phase short-circuit, two-phase short-circuit grounding and single-phase short-circuit grounding. When the three phases of the system are short-circuited, they are still in the symmetrical stated. Other types of shorted circuit are asymmetric short circuit. Which of the following types is a symmetrical short circuit? A. Single phsae ground short circuit B. Three phase short circuit C. Two phase short circuit D. Two phase ground short circuit
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If _____ voltage is applied across _____ circuit, _____ electric current will flow in _____ circuit.
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When measuring current, circuit power before connecting the meter in the circuit.
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With no resistance(电阻) in the circuit(电路) the current(电流) would increase forever.
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中国大学MOOC: ___________through a circuit, the current will lose part of its energy.