Question

several electric bulbs designed to be used on 220 volt Electric Supply line are rated 10 volt how many lamps can be connected in parallel with each other of 220 of current 5A​

Answer 1

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$\huge\fcolorbox{black}{aqua}{Solution:-}$

✒ ᴀɴsᴡᴇʀ:-

⛄ ʀᴇϙᴜɪʀᴇᴅ ɴᴏ. ᴏғ ʙᴜʟʙs= 110

✒ ᴇxᴘʟᴀɴᴀᴛɪᴏɴ:-

⛄ ᴘᴏᴛᴇɴᴛɪᴀʟ ᴅɪғғᴇʀᴇɴᴄᴇ, ᴠ= 220ᴠ

ᴘᴏᴡᴇʀ ᴏғ ᴇᴀᴄʜ ʙᴜʟʙ, ᴘ= 10 ᴡ

ʀᴇsɪsᴛᴀɴᴄᴇ ᴏғ ᴇᴀᴄʜ ʙᴜʟʙ, ʀ = ᴠ²/ᴘ = 220 × 220/ 10

= 4840 Ω

ᴛᴏᴛᴀʟ ʀᴇsɪsᴛᴀɴᴄᴇ ɪɴ ᴛʜᴇ ᴄɪʀᴄᴜɪᴛ,

ʀ' = ᴠ/1 = 220/5 = 44 Ω

ʟᴇᴛ ɴ ʙᴇ ᴛʜᴇ ɴᴜᴍʙᴇʀ ᴏғ ʙᴜʟʙs ᴛᴏ ʙᴇ ᴄᴏɴɴᴇᴄᴛᴇᴅ ɪɴ ᴘᴀʀᴀʟʟᴇʟ ᴛᴏ ᴏʙᴛᴀɪɴ ʀᴇsɪsᴛᴀɴᴄᴇ ʀ'.

1/ʀ' = 1/ʀ + 1/ʀ + ...... ɴ ᴛɪᴍᴇs

1/ʀ' = ɴ/ʀ

ɴ= ʀ/ʀ' = 4840/44

ɴ= 110

ᴛʜᴇʀᴇғᴏʀᴇ, ᴛʜᴇ ʀᴇϙᴜɪʀᴇᴅ ɴᴏ. ᴏғ ʙᴜʟʙs = 110.

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Answer 2

Explanation:

p.d,V=220

P=10W

R=V/I=220/5=44ohm

rest is in pic✌️