22.1.6. Input to Output Signal Relationship

Try these first

1. 1.

   What is a voltage amplifier and its primary function?

   Hint

   Think about what amplifiers do.

2. 2.

   How does adding a load to an amplifier affect its output?

   Hint

   Consider the implications of voltage division.

3. 3.

   What is the role of a voltage amplifier?

   • To decrease signal voltage
   • To amplify input voltage
   • To filter signals
   • None of the above

   Hint

   Consider the purpose of electronic amplifiers.

4. 4.

   True or False: The loading effect always increases the output voltage.

   • True
   • False

   Hint

   Think about how your circuit is influenced by adding loads.

5. 5.

   You have a voltage amplifier where the input voltage is 2V, and the gain is 15. Calculate the output voltage. Then, if you add a load of 500Ω at the output and the amplifier has an output resistance of 100Ω, determine how this affects the output voltage observed on the load.

   Hint

   Assume the load takes away a portion of the voltage; use the voltage divider rule.

6. 6.

   If the input resistance of the amplifier is 1000Ω and the source resistance is 200Ω, what is the effective input voltage supplied to the amplifier?

   Hint

   Remember how resistances in series in the input divide the voltage.