Question

Define the following and write their Si units.

a. Work done

b. Power

c. Energy

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Answer 1

★ $\colorbox{lime}{Answer :-}$

$\colorbox{pink}{(a)}$ᴡᴏʀᴋ ɪs sᴀɪᴅ ᴛᴏ ʙᴇ ᴅᴏɴᴇ ᴡʜᴇɴ ᴛʜᴇ ғᴏʀᴄᴇ ᴀᴘᴘʟɪᴇᴅ ᴏɴ ᴀɴ ᴏʙᴊᴇᴄᴛ ᴘʀᴏᴅᴜᴄᴇs ᴀ ᴅɪsᴘʟᴀᴄᴇᴍᴇɴᴛ ɪɴ ᴛʜᴇ ᴏʙᴊᴇᴄᴛ ɪɴ ᴛʜᴇ ᴅɪʀᴇᴄᴛɪᴏɴ ᴏғ ғᴏʀᴄᴇ s.ɪ ᴜɴɪᴛ ᴏғ ᴡᴏʀᴋ ᴅᴏɴᴇ = ᴊᴏᴜʟᴇ.

$\colorbox{pink}{(b)}$ᴡᴇ ᴄᴀɴ ᴅᴇғɪɴᴇ ᴘᴏᴡᴇʀ ᴀs ᴛʜᴇ ʀᴀᴛᴇ ᴏғ ᴅᴏɪɴɢ ᴡᴏʀᴋ, ɪᴛ ɪs ᴛʜᴇ ᴡᴏʀᴋ ᴅᴏɴᴇ ɪɴ ᴜɴɪᴛ ᴛɪᴍᴇ. ᴛʜᴇ sɪ ᴜɴɪᴛ ᴏғ ᴘᴏᴡᴇʀ ɪs ᴡᴀᴛᴛ (ᴡ) ᴡʜɪᴄʜ ɪs ᴊᴏᴜʟᴇs ᴘᴇʀ sᴇᴄᴏɴᴅ (ᴊ/s).

$\colorbox{pink}{(c)}$ᴇɴᴇʀɢʏ ɪs ᴛʜᴇ ϙᴜᴀɴᴛɪᴛᴀᴛɪᴠᴇ ᴘʀᴏᴘᴇʀᴛʏ ᴛʜᴀᴛ ᴍᴜsᴛ ʙᴇ ᴛʀᴀɴsғᴇʀʀᴇᴅ ᴛᴏ ᴀɴ ᴏʙᴊᴇᴄᴛ ɪɴ ᴏʀᴅᴇʀ ᴛᴏ ᴘᴇʀғᴏʀᴍ ᴡᴏʀᴋ ᴏɴ, ᴏʀ ᴛᴏ ʜᴇᴀᴛ, ᴛʜᴇ ᴏʙᴊᴇᴄᴛ.. ᴛʜᴇ sɪ ᴜɴɪᴛ ᴏғ ᴇɴᴇʀɢʏ ɪs ᴛʜᴇ ᴊᴏᴜʟᴇ.

Answer 2

WORK DONE :

$\longrightarrow$ When a force is applied on a object and it cause a displacement is known as work done.

• SI UNIT : Joule (J).
• FORMULA : Force × displacement.

POWER :

$\longrightarrow$ The amount of energy converted per unit time is said to be power.

• SI UNIT : Watt.
• FORMULA : $\sf P \ = \ \dfrac {W}{\triangle t}$

ENERGY :

$\longrightarrow$ The ability/capacity to do work is called as energy.

• SI UNIT : Joule (J).
• Two types of energy : Kinetic energy and potential energy.