Energy consumption of your phone charger without connecting your phone:

If 4 watts charger considers;

Full load current : at DC (Direct Current) voltage of 325v (output of diode bridge=230*1.414V)
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Full load current= Watt/Voltage=4/325=0.0123A

• As standard manufacturing value considered

Rectifier Current: 50 uA

Transformer current: 0.5% of full load current

• 0.005*0.0123
• 5 uA

Thyristor+Others no load current= 10% of full load current

• • =0.1*0.0123
  • 00123A

No load power consumption of my charger=V* no load current(Rectifier(4 diodes)+TFR+Thyristor+other)

• 325*(50*4*10^-6+61.5*10^-6+1230*10^-6) watt
• 4 Watt per hour

Per day= 0.4*24

• 6 Watts per day=0.0096 units

Per month=9.6 * 30

• 288 Watts=0.288 units
• Units cost= 2.89 Rs per unit

Cost per month= 0.288*2.89= 0.8 Rs

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