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
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
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 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
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 isolating switch model is GN2-10/1000, meaning ( ). A: Rated voltage 2KV, rated current 10A B: Rated voltage 2KV, rated current 1000A C: Rated voltage 10KV, rated current 1KA D: Rated voltage 10KV, rated current 10KA
The isolating switch model is GN2-10/1000, meaning ( ). A: Rated voltage 2KV, rated current 10A B: Rated voltage 2KV, rated current 1000A C: Rated voltage 10KV, rated current 1KA D: Rated voltage 10KV, rated current 10KA
A transistor is a ( )operated device. A: voltage B: current C: both voltage and current D: none of the above
A transistor is a ( )operated device. A: voltage B: current C: both voltage and current D: none of the above
The effective value of ac voltage or current is（ ） A: The average value of a voltage or current B: DC equal to the AC thermal effect is defined as the effective value of AC C: voltage or current are 0.707 of their amplitudes D: closely related to the frequency of alternating current
The effective value of ac voltage or current is（ ） A: The average value of a voltage or current B: DC equal to the AC thermal effect is defined as the effective value of AC C: voltage or current are 0.707 of their amplitudes D: closely related to the frequency of alternating current
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.
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.
“必须求出此电阻上的电压和电流。”一句的英文表达，哪一项正确？ A: It is necessary to find out the voltage and current of this resistor. B: It is necessary to find out the voltage and current on this resistor. C: It is necessary to find out the voltage and current for this resistor. D: It is necessary to find out the voltage across and current through this resistor.
“必须求出此电阻上的电压和电流。”一句的英文表达，哪一项正确？ A: It is necessary to find out the voltage and current of this resistor. B: It is necessary to find out the voltage and current on this resistor. C: It is necessary to find out the voltage and current for this resistor. D: It is necessary to find out the voltage across and current through this resistor.
Ohm’s Law states that current equals voltage divided by resistance. Current increases with the increase in voltage. Current decreases with the increase in resistance.
Ohm’s Law states that current equals voltage divided by resistance. Current increases with the increase in voltage. Current decreases with the increase in resistance.
Ohm's Law is the algebraic relationship between voltage and current for a _______.
Ohm's Law is the algebraic relationship between voltage and current for a _______.