7.4. Current Relationships in BJT

Try these first

1. 1.

   What is the relationship between the emitter current (IE), collector current (IC), and base current (IB)?

   Hint

   Recall the main equation for these currents.

2. 2.

   What does the symbol β represent in BJTs?

   Hint

   Think about how BJTs amplify currents.

3. 3.

   What is the correct equation for emitter current in a BJT?

   • IE = IC + IB
   • IC = IE + IB
   • IB = IC + IE

   Hint

   Think about how currents are related in BJTs.

4. 4.

   True or False: The typical value of α in a BJT is approximately 1.

   • True
   • False

   Hint

   Consider the efficiency of BJTs in terms of current amplification.

5. 5.

   A circuit has a BJT with an emitter current of 8 mA and a collector current of 6 mA. Calculate the base current, current gain (β), and common base current gain (α).

   Hint

   Use provided equations to isolate each current type and then use the ratios.

6. 6.

   If a BJT operates with β = 200 and IB = 0.2 mA, what would be the collector current? Assuming no saturation effects.

   Hint

   Remember the relationship between IB and IC through current gain.