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.
举一反三
- When a BJT is in cutoff, the collector-to-emitter voltage is typically equal to _____ A: collector supply voltage B: collector current times collector resistor C: 0.3 Volts D: emitter voltage
- When a BJT is biased in the cutoff region the collector-to-emitter voltage is typically equal to （ ）. A: the emitter voltage B: the collector supply voltage C: 0.03 V D: the collector current times the collector resistor
- When a BJT is operating in the active region, the voltage drop from the base to the emitter VBE is approximately equal to the____ A: base bias voltage B: base current times the base resistor C: diode drop (about 0.7 V) D: emitter voltage
- 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
- To find the right job in a desired field, it is necessary that you ____ what the current trends are.
内容
- 0
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
- 1
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
- 2
A transistor is a ( )operated device. A: voltage B: current C: both voltage and current D: none of the above
- 3
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
- 4
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