Question

A bulb is rated at 200v- 100w.Find the resistance of the bulb

Answer 1

Explanation:

see the attachment

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Answer 2

AnswEr :-

• Resistance of the bulb is 400Ω.

Given :-

• A bulb is rated at 200V - 100W.

To Find :-

• Resistance of the bulb.

SoluTion :-

Calculation of resistance : Here we know the voltage and power of the bulb. So, the resistance can be calculated by using the formula :

• P = V²/R

Here, Power, P = 100 watts

Voltage, V = 200 volts

And, Resistance, R = ? [ to be calculated ]

Now putting these values in the above formula, we get :

• 100 = (220)²/R

→ 100 R = 40000

→ R = 40000/100

→ R = 400 ohms

Hence, its resistance is 400Ω.

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