Question

An electric refrigerator rated 400w operates 8 hours/day. what is the cost of the energy to operate it for 30 days at rs. 3 per kwh

Answer 1

Energy consumed per day
4.0 kw × 8 =32 kwh/day

Energy consumed in 30 days
32 kwh × 30 = 960 kW.h

Bill amount: 960 × 3 kwh = 2880 rupees

Answer 2

ʜᴇʏᴀ ᴍᴀᴛᴇ!!

ʜᴇʀᴇ ɪs ᴜʀ ᴀɴsᴡᴇʀ ⏬ ⏬

ɢɪᴠᴇɴ,

ᴘᴏᴡᴇʀ = ᴘ = 400ᴡ = 400/1000 ᴋᴡ = 0.4 ᴋᴡ

ᴛᴏᴛᴀʟ ᴛɪᴍᴇ ғᴏʀ ᴡʜɪᴄʜ ᴛʜᴇ ʀᴇғʀɪɢᴇʀᴀᴛᴏʀ ᴏᴘᴇʀᴀᴛᴇᴅ = ᴛ = 8 ʜᴏᴜʀs x 30 ᴅᴀʏs = 240 ʜ

sɪɴᴄᴇ, ᴇɴᴇʀɢʏ ᴄᴏɴsᴜᴍᴇᴅ = ᴘ x ᴛ ᴇ = 0.4 x 240 ᴋᴡʜ = 96 ᴋᴡʜ

ᴛʜᴇʀᴇғᴏʀᴇ, ᴛᴏᴛᴀʟ ᴄᴏsᴛ ʀᴇϙᴜɪʀᴇᴅ ᴛᴏ ᴏᴘᴇʀᴀᴛᴇ ᴛʜᴇ ʀᴇғʀɪɢᴇʀᴀᴛᴏʀ ғᴏʀ ᴛʜᴇ ᴍᴏɴᴛʜ = 96 x 30 = 2880 ɪɴʀ.