15.2.2. Collector Current Calculation

Try these first

1. 1.

   What is the formula for calculating collector current from base current?

   Hint

   Think about the relationship between input and output currents in BJTs.

2. 2.

   What does the Q-point represent in a BJT circuit?

   Hint

   Consider what point on the I-V characteristic tells you about the transistor's state.

3. 3.

   What is the primary function of the base current in a BJT?

   • To provide power
   • To control collector current
   • To dissipate heat

   Hint

   Remember the role of the input current in the circuit.

4. 4.

   Is the collector current dependent on input voltage?

   • True
   • False

   Hint

   Think about how variations at the base affect overall performance.

5. 5.

   Design a common emitter amplifier circuit. Given a desired collector current of 2 mA and a β of 150, what must the base current be? Assume V_BE(on) is 0.7 V.

   Hint

   Remember to use the relationship I_c = β × I_b.

6. 6.

   A circuit has a load resistor of 1 kΩ and experiences a collector current of 10 mA. If the supply voltage is 15 V, calculate the collector voltage and determine the power dissipated across the load.

   Hint

   Use Ohm's law to relate current to voltage across the load.