Question

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GOOD EVENING!!❤❤

My question is---

Two lamps, one rated 100W at 220V, and the other 60W at 220V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220V?

Plz give explaination!!
The correct one will be marked brainliest!!✌

Answer 1

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

Answer 2

answer is 8÷11ampere as P=VI and in parallel total current is equal to current draw by each conductor .
total current =(100÷220) +(60÷220)
=8÷11 ampere