It can be measured by HF9600E Multi-Function Power Meter（ ）
A: Current RMS
B: voltage RMS
C: instantaneous power
D: active power
A: Current RMS
B: voltage RMS
C: instantaneous power
D: active power
A,B,D
举一反三
- The function of direct current regulated power supply is to input an alternating current power of 220volts, so that it can output __________.( ) A: alternating current 200 volts voltage B: direct current 24 volts voltage C: direct current 200 volts voltage D: alternating current 24 volts voltage
- The<br/>common-base amplifier has _()()()__. A: voltage gain, current gain, and power gain B: voltage gain and power gain, but no current gain C: current gain and power gain, but no voltage gain D: current gain and voltage gain, but no power gain
- For the generator control panel onboard a ship with AC electrical power network, it has voltage meter, current meter, and ( ) also. A: frequency<br/>meter, power meter, and power factor meter B: frequency<br/>meter, power meter and mega ohm meter C: frequency<br/>meter, power meter and rotating speed meter D: frequency<br/>meter, mega ohm meter and rotating speed meter
- The voltage meter and current meter on the main switchboard shows ( <br/>). A: phase voltage and phase current of generator B: line voltage and line current of generator C: line voltage and line current of crane D: line voltage and line current of shore power
- ( ) is not the index of power quality. A: voltage B: current C: frequency D: waveform
内容
- 0
Which of these is not an electrical quantity（） A: time B: voltage C: current D: power
- 1
The plus (+) and minus (-) signs in an electric circuit diagram are used to define . A: . voltage polarity B: . current direction C: . power flow D: . absorbed power
- 2
When measuring current, circuit power before connecting the meter in the circuit.
- 3
The voltage source in the circuit（ ）.[img=166x83]1803a2ffaa8699a.jpg[/img] A: provides power B: neither provides power nor absorbs power C: absorbs power D: whether to develop power or absorb power depends on R
- 4
In a linear regulator, the purpose of using the power transistor is to ( ). A: Increase output voltage B: Increase output current