Question

i)How fuse is helpful in domestic electric circuits

ii)Why does the cord of an electric heater not glow while the heating element

does?​

Answer 1

Explanation:

• ᴀɴ ᴇʟᴇᴄᴛʀɪᴄ ꜰᴜꜱᴇ ɪꜱ ᴀ ꜱᴀꜰᴇᴛy ᴅᴇᴠɪᴄᴇ ᴜꜱᴇᴅ ᴛᴏ ʟɪᴍɪᴛ ᴛʜᴇ ᴄᴜʀʀᴇɴᴛ ɪɴ ᴀɴ ᴇʟᴇᴄᴛʀɪᴄ ᴄɪʀᴄᴜɪᴛ. ᴛʜᴇ ᴜꜱᴇ ᴏꜰ ᴀ ꜰᴜꜱᴇ ɪꜱ ᴛᴏ ꜱᴀꜰᴇɢᴜᴀʀᴅ ᴛʜᴇ ᴇʟᴇᴄᴛʀɪᴄ ᴄɪʀᴄᴜɪᴛ ᴀɴᴅ ᴛʜᴇ ᴇʟᴇᴄᴛʀɪᴄ ᴀᴩᴩʟɪᴀɴᴄᴇꜱ ᴄᴏɴɴᴇᴄᴛᴇᴅ ɪɴ ᴛʜᴇ ᴇʟᴇᴄᴛʀɪᴄ ᴄɪʀᴄᴜɪᴛ ꜰʀᴏᴍ ʙᴇɪɴɢ ᴅᴀᴍᴀɢᴇᴅ.

• ᴛʜᴇ ʜᴇᴀᴛᴇʀ'ꜱ ʜᴇᴀᴛɪɴɢ ᴇʟᴇᴍᴇɴᴛ ɪꜱ ᴍᴀᴅᴇ ᴜᴩ ᴏꜰ ᴀɴ ᴀʟʟᴏy ᴛʜᴀᴛ ʜᴀꜱ ᴠᴇʀy ʜɪɢʜ ʀᴇꜱɪꜱᴛᴀɴᴄᴇ, ꜱᴏ ᴡʜᴇɴ ᴄᴜʀʀᴇɴᴛ ꜰʟᴏᴡꜱ ᴛʜʀᴏᴜɢʜ ᴛʜᴇ ʜᴇᴀᴛɪɴɢ ᴇʟᴇᴍᴇɴᴛ, ɪᴛ ʙᴇᴄᴏᴍᴇꜱ ᴛᴏᴏ ʜᴏᴛ ᴀɴᴅ ɢʟᴏᴡꜱ ʀᴇᴅ. ʙᴜᴛ ᴛʜᴇ ᴄᴏʀᴅ'ꜱ ʀᴇꜱɪꜱᴛᴀɴᴄᴇ, ᴡʜɪᴄʜ ɪꜱ ᴜꜱᴜᴀʟʟy ᴏꜰ ᴄᴏᴩᴩᴇʀ ᴏʀ ᴀʟᴜᴍɪɴɪᴜᴍ, ɪꜱ ʟᴏᴡ, ꜱᴏ ɪᴛ ᴅᴏᴇꜱ ɴᴏᴛ ɢʟᴏᴡ.

Answer 2

Answer:

i) An electric fuse is a safety device used to limit the current in an electric circuit. The use of a fuse is to safeguard the electric circuit and the electric appliances connected in the electric circuit from being damaged.

ii) The heater's heating element is made up of an alloy that has very high resistance, so when current flows through the heating element, it becomes too hot and glows red. But the cord's resistance, which is usually of copper or aluminium, is low, so it does not glow.

Thank you.