Physics, asked by sammaria, 9 months ago

two lamps rated 100W, 220V and the other 60W, 220V are connected in parallel to electric mains supply.find the current drawn by two bulbs if the supply voltage is 220V?

Answers

Answered by mahalakshmi010100
5

Answer:

HI !

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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Answered by crbedutech
1

Total current = 8/11 Ampere

Explanation:

The power of any appliance W = V I

here W is the power of lamp

V is the potential difference applied

I is the current flowing through the bulb .

Thus the current through first lamp I₁ = W/V = 100/220 Ampere

The current through second lamp I₂ = 60/220

Total current I = I₁ + I₂ = 100/220 + 60/220 = 160/220 = 8/11 Ampere

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