Question

State joules law. Explain the working of electric filament bulb

Answer 1

Answer:

Joule's law of heating states that the power of heating generated by an electrical conductor is proportional to the product of it's resistance and the square of the electric current passing through the conductor . ... The resistance of filaments heat the bulb

Explanation:

The filament in an electric bulb is made using tungsten which would burn quickly when it comes in contact with the oxygen in the air. This is the reason why unreactive gases such as argon and nitrogen are used for filling an electric bulb. These gases are chemically interactive.

(2)

Given parameters

Power (P) = 840 W

Voltage (V) = 220V

To calculate I =? and R =?

Power input (P) = VI

I = P/V

I = 840/220

I = 3.82 A

The resistance of the electric iron (R) = V/I

R = 220/3.82

R = 57.59 Ω

Answer 2

Explanation:

Joule's law of heating states that the power of heating generated by an electrical conductor is proportional to the product of it's resistance and the square of the electric current passing through the conductor . ... The resistance of filaments heat the bulb