Question

two bulbs of 60W, 200V and 100 W, 200V are joined in series and connected to 220 Volt mains. calculate the current in them

Answer 1

Here's your answer mate. Good Luck.

Answer 2

Given :

Two bulbs of 60 W, 200 V and 100 W, 200 V are joined in series .

Voltage applied , 220 V .

To Find :

The current through the bulbs .

Solution :

We know , power is given by :

$P=\dfrac{V^2}{R}$

Therefore , $R=\dfrac{V^2}{P}$

So , $R_1=\dfrac{200^2}{60}=666.67\ ohms$

$R_2=\dfrac{200^2}{100}=400\ ohms$

Now , by ohm's law :

$I=\dfrac{V}{R}$

Here ,

$R=R_1+R_2\\\\R=666.67+400=1066.67\ ohms$

So ,

$I=\dfrac{220}{1066.67}\\\\I=0.21\ A$

Therefore , the current is 0.21 A .

Learn More :

Electrostatics

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