Question

Derive Expression of the Ohm's Law. {CLASS 10}

Answer 1

ᴏʜᴍ's ʟᴀᴡ ᴀɴᴅ ʀᴇsɪsᴛᴀɴᴄᴇ. ᴏʜᴍ's ʟᴀᴡ sᴛᴀᴛᴇs ᴛʜᴀᴛ ᴛʜᴇ ᴠᴏʟᴛᴀɢᴇ ᴏʀ ᴘᴏᴛᴇɴᴛɪᴀʟ ᴅɪғғᴇʀᴇɴᴄᴇ ʙᴇᴛᴡᴇᴇɴ ᴛᴡᴏ ᴘᴏɪɴᴛs ɪs ᴅɪʀᴇᴄᴛʟʏ ᴘʀᴏᴘᴏʀᴛɪᴏɴᴀʟ ᴛᴏ ᴛʜᴇ ᴄᴜʀʀᴇɴᴛ ᴏʀ ᴇʟᴇᴄᴛʀɪᴄɪᴛʏ ᴘᴀssɪɴɢ ᴛʜʀᴏᴜɢʜ ᴛʜᴇ ʀᴇsɪsᴛᴀɴᴄᴇ, ᴀɴᴅ ᴅɪʀᴇᴄᴛʟʏ ᴘʀᴏᴘᴏʀᴛɪᴏɴᴀʟ ᴛᴏ ᴛʜᴇ ʀᴇsɪsᴛᴀɴᴄᴇ ᴏғ ᴛʜᴇ ᴄɪʀᴄᴜɪᴛ. ᴛʜᴇ ғᴏʀᴍᴜʟᴀ ғᴏʀ ᴏʜᴍ's ʟᴀᴡ ɪs ᴠ=ɪʀ.

Answer 2

According to ohm's law, the potential difference is directly proportional to current, i.e.,

$V\propto \: I$

This implies,

$V = IR$

Where, R is the constant of proportionality. It is called resistance.

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