28.2.8. Voltage Drop Calculations

Try these first

1. 1.

   What is the formula for calculating voltage drop across a resistor?

   Hint

   Remember Ohm's Law.

2. 2.

   Define beta (β) in the context of transistors.

   Hint

   Think of it as the transistor's amplification factor.

3. 3.

   What is the effect of beta on collector current in a fixed bias circuit?

   • It has no effect
   • It increases collector current
   • It decreases collector current

   Hint

   Remember, beta is the amplification factor of the transistor.

4. 4.

   The output voltage of a common emitter amplifier is affected by which factor?

   • Only the input voltage
   • The load resistance
   • Both input voltage and load resistance

   Hint

   Think about how changes in these parameters affect amplifier operation.

5. 5.

   Given a fixed bias CE amplifier with a supply voltage of 15V, a beta of 100, and a collector resistor of 2 kΩ. If the beta changes to 300, what would be the new collector voltage and current if the design allows?

   Hint

   Use the voltage drop formula and ensure you consider the voltage limit to avoid saturation.

6. 6.

   Design a circuit with a cell bias configuration that maintains a collector current of 3 mA. List the resistors needed to achieve this with a supply voltage of 10V and react to varying beta.

   Hint

   Apply the cell bias rationale to increase stability across varying beta.