semiconductor diodes

Discussion in 'General Electronics Chat' started by MUZZA, Jul 17, 2011.

  1. MUZZA

    Thread Starter New Member

    Jul 17, 2011
    2
    0
    a semiconductor diode is connected in series with a 16 ohm heater element to a 240 volt a.c supply.Can the supply voltage be used to work out heater current?
     
  2. narasimhan

    Member

    Dec 3, 2009
    72
    6
    Since its AC the diode transient response also needs to be taken into account. The 240 V AC is RMS value of voltage. So whatever current you calculate is also RMS value of the AC current
     
  3. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    If the heater element is purely resistive the current will correspond to a half-wave rectified circuit configuration.

    The diode will drop about 0.7V in forward conduction.

    The peak load voltage will then be 240√2-0.7=339.4-0.7=338.7V

    The peak load current will then be Im= 338.7/16=21.17A

    The RMS load current will be Im/2=10.585A

    The average load current will be Im/∏=6.74A
     
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