Question 5
- Figure 3 is the diagram of a non-inverting operational amplifier.
- State four applications of operational amplifier.
If the voltage gain of the amplifier is 21, calculate the value of R1.
The expected responses were:
(a) 
(b) Applications of operational amplifier
- Filter circuit
- Electrocardiogram amplification
- Differentiator
- Integrator
- Summing circuit
- Strain gauge
- Piezoelectric transducer
- Comparator
- Voltage follower
- Inverting and non-inverting amplification
The Chief Examiner reported that majority of the candidates that attempted this question responded did not do quite well with their response to the tasks.