9.3.1. Example Problem Setup

Try these first

1. 1.

   What is the role of the base current in a transistor?

   Hint

   Think about what smaller current influences a larger current.

2. 2.

   Describe what happens in a forward-biased n-p-n transistor.

   Hint

   Focus on the potential differences in a forward setup.

3. 3.

   What is the current flow direction in an n-p-n transistor?

   • From collector to emitter
   • From emitter to collector
   • No current flows

   Hint

   Visualize the current highways in the transistor.

4. 4.

   True or False: In a p-n-p transistor, the base current is always negative.

   • True
   • False

   Hint

   Remember how bias voltages are set.

5. 5.

   If an n-p-n transistor has a base-emitter voltage of 0.7 V and a collector-emitter voltage of 5 V, what are the conditions for proper operation?

   Hint

   Check biasing conditions.

6. 6.

   Consider a circuit with a p-n-p transistor where the base current is increased to 20 µA with β = 100. Calculate the new collector current.

   Hint

   Use the gain formula for calculation.