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
A: . voltage polarity
B: . current direction
C: . power flow
D: . absorbed power
举一反三
- If _____ voltage is applied across _____ circuit, _____ electric current will flow in _____ circuit.
- If _____ voltage is applied across circuit, electric current will flow in circuit. A: a B: an C: the D: 不填冠词
- 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
- 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
- For the sinusoidal steady-state circuit, ， the real power absorbed by 5 W resistor is 10W ， the power factor of the circuit is:/ananas/latex/p/149319