___battery is ___device which gives ___constant voltage (恒定电压).
举一反三
- There are two identical batteries in series, which statement is true?( ) A: The total voltage equals the sum of the voltages of each battery. B: The total voltage equals any battery voltage. C: The total voltage equals half of one battery voltage
- Which component in the ignition circuit provides high voltage in the secondary circuit? A: Ballast resistor B: Ignition coil C: Battery D: Ignition distributor
- If the voltage remains constant, the more the resistance, the less the current.
- 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
- A JFET is a three-terminal device which is （）. A: current-controlled device B: voltage-controlled device