22.1.7. Loading Effects in Amplifiers

Try these first

1. 1.

   What is the loading effect in amplifiers?

   Hint

   Think about how connecting additional components affects voltage.

2. 2.

   What does input resistance represent?

   Hint

   Consider what happens to voltage when more resistance is introduced.

3. 3.

   What is the loading effect?

   • Change in frequency response
   • Change in output voltage due to load
   • Change in input resistance

   Hint

   Consider what happens to voltage when loads are introduced.

4. 4.

   True or False: Output resistance affects how voltage is available to a load.

   • True
   • False

   Hint

   Think about the relationship between resistance and voltage delivery.

5. 5.

   Given a voltage amplifier with an open-loop gain of 100 and an output resistance of 200 ohms, calculate the output voltage when a load of 50 ohms is connected.

   Hint

   Understand the impact of loading on the voltage-combining resistances.

6. 6.

   Discuss how cascading two voltage amplifiers with respective gains of 50 and 10, each with an output resistance of 100 ohms and input resistance of 500 ohms, would affect the overall gain.

   Hint

   Draw the circuit and apply voltage divider rules to simplify.