Question

pls slove this question​

Answer 1

Answer:

Correct option is A)

IfR=r

P

max

=

4r

E

2

ρ=VI

I=

V

B

ρ

=

100

500

=5A

V

R

=IR=(230−100)=5R

R=26Ω

Hence,optionAisthecorrectanswer.

Answer 2

GIVEN

• For filament bulb
• Power = 500 Watt
• Voltage = 100 volt

• Power supply
• Votage = 230 volt

• Now current taken by filament
• I = P/V
• I = 500/100 = 5 A

• For providing 5 amperes current let we use resistance R , show that
• potiential difference = 230 - 100 = 130 volt

• Now V = IR
• 130 = 5×R
• R = 130/5
• R = 26 ohm.

Hence when bulb consume 500W power, resistance required 26 ohm.