A: base bias voltage
B: base current times the base resistor
C: diode drop (about 0.7 V)
D: emitter voltage
举一反三
- 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 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
- β is the ratio of _____. A: collector current to emitter current B: base current to collector current C: collector current to base current D: emitter current to collector current
- The base frame is the____ of the robot.
- 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
内容
- 0
when a transistor is in the forward-active mode, the collector current is constant with a constant base current
- 1
In the common-emitter circuit with a fixed bias, the most often used mothed to regulate the base current is to regulate ( )
- 2
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.
- 3
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
- 4
标准以太网指的是 ( ) A: 10 BASE 5 B: 10 BASE 2 C: 10 BASE T D: 100 BASE T