Question

Ak balb 40watt ka ha aur 200 volt par kary karta hai to resistance find

Answer 1

Answer:

P = V^2/R

R = V^2/P

= (200× 200)/40

= 1000 ohm

Answer 2

$\color{darkblue}\underline{\underline{\sf Given-}}$

• Power of bulb (P) = 40 Watt
• Voltage of bulb (V) = 200Volt

$\color{darkblue}\underline{\underline{\sf To\:Find-}}$

• Resistance of bulb (R)

Power is rate at which energy is transferred

$\implies{\sf P=\dfrac{\Delta U}{\Delta t}}$

$\implies{\sf P=V.\dfrac{\Delta q}{\Delta t}}$

$\color{orange}\implies{\sf P=Vi}$

According to Ohm's law -

$\color{skyblue}\odot\boxed{\sf P=\dfrac{V^2}{R}}$

On Putting Value

$\implies{\sf 40=\dfrac{200^2}{R} }$

$\implies{\sf R=\dfrac{200×200}{40} }$

$\color{red}\implies{\sf R= 1000Ω }$

$\color{darkblue}\underline{\underline{\sf Answer-}}$

Resistance of bulb is $\color{red}{\sf 1000Ω}$ .