Experiment 4
FULLWAVE RECTIFIER
Objectives:
- To understand the operation of fullwave rectifier
- To measure the equivalent dc output voltage of the rectifier
Materials:
Diodes, Resistor, Step down transformer, DC Voltmeter, Ammeter, Breadboard and Oscilloscope
Rectifier changes ac to dc and it is an essential part of power supply. The unique property of a
diode, permitting the current to flow in one direction, is utilized in rectifiers.
Both the positive half and the negative cycles of the stepped down ac supply pass through the
diode in a full wave rectifier. There are two types of full wave rectifier, the one using a center-tap
transformer and the one using a bridge rectifier. The output of a bridge type rectifier is twice the output
of a center-tap transformer using the same input signal
Procedures:
1.
2.
3.
4.
Connect the full wave rectifier circuit.
Turn on the circuit.
Measure the peak to peak output voltage of the secondary side of the transformer.
Observe the waveform across the load resistor. Measure its frequency and peak output voltage.
Draw the waveform below and properly label the waveform.
5. Connect the dc voltmeter across the load resistor. Record the measured value: ______ V
6. From the formula, calculate the average voltage.
𝑉𝐷𝐶 =
2𝑉𝑃
𝜋
7. Calculate the percentage error.
%𝐸𝑟𝑟𝑜𝑟 =
𝑀𝑒𝑎𝑠𝑢𝑟𝑒𝑑 − 𝑇ℎ𝑒𝑜𝑟𝑒𝑡𝑖𝑐𝑎𝑙
100%
𝑀𝑒𝑎𝑠𝑢𝑟𝑒𝑑
What causes the difference in the measured and theoretical value?
CONCLUSION: