semiconductor diodes

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

  1. MUZZA

    Thread Starter New Member

    Jul 17, 2011
    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


    Dec 3, 2009
    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
    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