Question

an electric bulb is rated at 220V,100W.What is it's resistance? ​

Answer 1

Answer:

The resistance will increase due to the heat of the filament. So lets do some maths, 100÷220=0.4545 amps now to find the resistance using ohms law 220÷0.4545=484 ohms. This is when lamp is drawing current. An electric bulb is rated as 220V 100W.

Explanation:

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Answer 2

Answer:

Resistance = 484 ohm

Explanation:

$power = \frac{v^{2} }{r} \\ 100 = \frac{ {(220)}^{2} }{r } \\ 100r = {(220)}^{2} \\ 100r = 220 \times 220 \\ r = \frac{220 \times 220}{100} \\ r \: = 484 \: \: \: \: \: \: \: \: \: \: \:$

here,

• r = resistance
• v = potential difference