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Bridge-type rectifier is most frequently used for full-wave rectification.
D2 and D3 conduct in positive half cycle while D1 and D4 conduct in negative half cycle.
D1 and D3 cannot be conduct on the same time. Similarly D2 and D4 cannot conduct simultaneously.
When the 10Vrms of AC signal is applied to the circuit above, where the peak value of the AC input signal is
Ep = 2xErms = 1.414x(10) = 14.14V
and the average full wave output signal is
Eave = Edc = 0.636xEp = 0.636x14.14 = 9V
Therefore, we can see that a 10Vrms voltage is equivalent to 9Vdc for full-scale deflection.
WE CAN CONCLUDE THAT,
When full wave rectification is used, the pointer will deflect to 90% of full scale.
This means an ac voltmeter using full wave rectification has sensitivity equal to 90% of the dc sensitivity.
As with the half wave rectifier, the circuit would be designed for full-scale deflection, which means the value of the multiplier resistor would be only 90% of the value for a 10V dc voltmeter.
Sac = 0.9Sdc
Video on D'Arsonval Meter Movement on Full-Wave Rectifier
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