Question

Two lamps one rated 100W - 20V and other 60W - 220 V are connected in parallel to a 220 volt supply. What is the current drawn from the supply line?

⚠ NO SPAMS ALLOWED ❌

Answer 1

as they are in parallel , so
I = I¹ + I²
I¹= 100/20. (P=VI)
I¹=5

I²=60/220
=3/11

I=5+3/11
=58/11

Answer 2

Power = P = 100 W
Voltage = V = 220v
Resistance = R

P = V²/R
100 = 220 ×220/R
R  = 220 × 220/100
     = 484 Ω
==========================
Power = P = 60 W
Voltage = V = 220v
Resistance = R

P = V²/R
60 = 220 × 220/R
R = 220× 220/60
    = 806.7 Ω
=========================
As the resistors are connected in parallel , 
total resistance = 1/R

1/R = 1/484 + 1/806.7
      =  806.7 + 484/484×806.7
      = 1290.7/390442.8
R = 390442.8/ 1290.7 = 302.5 ohms
    
  Total resistance = 302.5 Ω


I = current

V = IR
220 = I × 302.5

I = 220/302.5
   = 0.73 A

The current drawn is 0.73 A

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