{"id":92795,"date":"2025-06-01T11:32:45","date_gmt":"2025-06-01T11:32:45","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=92795"},"modified":"2025-06-01T11:32:45","modified_gmt":"2025-06-01T11:32:45","slug":"an-electric-refrigerator-rated-400-w-operates-10-hours-day-what-is-th","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/an-electric-refrigerator-rated-400-w-operates-10-hours-day-what-is-th\/","title":{"rendered":"An electric refrigerator rated 400 W operates 10 hours\/day. What is th"},"content":{"rendered":"

An electric refrigerator rated 400 W operates 10 hours\/day. What is the cost of the energy to operate it for 30 days at \u20b9 3.00 per kWh?<\/p>\n

[amp_mcq option1=”\u20b9 360″ option2=”\u20b9 3,600″ option3=”\u20b9 36″ option4=”\u20b9 400″ correct=”option1″]<\/p>\n

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This question was previously asked in<\/div>\n
UPSC CISF-AC-EXE – 2020<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe power rating of the refrigerator is 400 W, which is equal to 0.4 kW (since 1 kW = 1000 W). The refrigerator operates for 10 hours per day. Over 30 days, the total operation time is 10 hours\/day * 30 days = 300 hours. The total energy consumed is the power multiplied by the time: Energy (kWh) = Power (kW) * Time (hours) = 0.4 kW * 300 hours = 120 kWh. The cost of energy is \u20b9 3.00 per kWh. Total cost = Energy consumed * Cost per kWh = 120 kWh * \u20b9 3.00\/kWh = \u20b9 360.
\n<\/section>\n
\nEnergy consumed is calculated as Power (in kW) multiplied by Time (in hours). The total cost is the energy consumed multiplied by the rate per unit of energy (kWh).
\n<\/section>\n
\nThe unit of energy used for billing is typically the kilowatt-hour (kWh), often called a ‘unit’ of electricity. Power in watts needs to be converted to kilowatts before calculating energy in kWh if time is in hours.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

An electric refrigerator rated 400 W operates 10 hours\/day. What is the cost of the energy to operate it for 30 days at \u20b9 3.00 per kWh? [amp_mcq option1=”\u20b9 360″ option2=”\u20b9 3,600″ option3=”\u20b9 36″ option4=”\u20b9 400″ correct=”option1″] This question was previously asked in UPSC CISF-AC-EXE – 2020 Download PDFAttempt Online The power rating of the … <\/p>\n

Detailed SolutionAn electric refrigerator rated 400 W operates 10 hours\/day. What is th<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1089],"tags":[1288,1201,1128],"class_list":["post-92795","post","type-post","status-publish","format-standard","hentry","category-upsc-cisf-ac-exe","tag-1288","tag-electric-current","tag-physics","no-featured-image-padding"],"yoast_head":"\nAn electric refrigerator rated 400 W operates 10 hours\/day. What is th<\/title>\n<meta name=\"description\" content=\"The power rating of the refrigerator is 400 W, which is equal to 0.4 kW (since 1 kW = 1000 W). The refrigerator operates for 10 hours per day. Over 30 days, the total operation time is 10 hours\/day * 30 days = 300 hours. The total energy consumed is the power multiplied by the time: Energy (kWh) = Power (kW) * Time (hours) = 0.4 kW * 300 hours = 120 kWh. The cost of energy is \u20b9 3.00 per kWh. Total cost = Energy consumed * Cost per kWh = 120 kWh * \u20b9 3.00\/kWh = \u20b9 360. Energy consumed is calculated as Power (in kW) multiplied by Time (in hours). The total cost is the energy consumed multiplied by the rate per unit of energy (kWh).\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/an-electric-refrigerator-rated-400-w-operates-10-hours-day-what-is-th\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"An electric refrigerator rated 400 W operates 10 hours\/day. What is th\" \/>\n<meta property=\"og:description\" content=\"The power rating of the refrigerator is 400 W, which is equal to 0.4 kW (since 1 kW = 1000 W). The refrigerator operates for 10 hours per day. Over 30 days, the total operation time is 10 hours\/day * 30 days = 300 hours. The total energy consumed is the power multiplied by the time: Energy (kWh) = Power (kW) * Time (hours) = 0.4 kW * 300 hours = 120 kWh. The cost of energy is \u20b9 3.00 per kWh. Total cost = Energy consumed * Cost per kWh = 120 kWh * \u20b9 3.00\/kWh = \u20b9 360. Energy consumed is calculated as Power (in kW) multiplied by Time (in hours). The total cost is the energy consumed multiplied by the rate per unit of energy (kWh).\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/an-electric-refrigerator-rated-400-w-operates-10-hours-day-what-is-th\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T11:32:45+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"An electric refrigerator rated 400 W operates 10 hours\/day. What is th","description":"The power rating of the refrigerator is 400 W, which is equal to 0.4 kW (since 1 kW = 1000 W). The refrigerator operates for 10 hours per day. Over 30 days, the total operation time is 10 hours\/day * 30 days = 300 hours. The total energy consumed is the power multiplied by the time: Energy (kWh) = Power (kW) * Time (hours) = 0.4 kW * 300 hours = 120 kWh. The cost of energy is \u20b9 3.00 per kWh. Total cost = Energy consumed * Cost per kWh = 120 kWh * \u20b9 3.00\/kWh = \u20b9 360. Energy consumed is calculated as Power (in kW) multiplied by Time (in hours). The total cost is the energy consumed multiplied by the rate per unit of energy (kWh).","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/exam.pscnotes.com\/mcq\/an-electric-refrigerator-rated-400-w-operates-10-hours-day-what-is-th\/","og_locale":"en_US","og_type":"article","og_title":"An electric refrigerator rated 400 W operates 10 hours\/day. What is th","og_description":"The power rating of the refrigerator is 400 W, which is equal to 0.4 kW (since 1 kW = 1000 W). The refrigerator operates for 10 hours per day. Over 30 days, the total operation time is 10 hours\/day * 30 days = 300 hours. The total energy consumed is the power multiplied by the time: Energy (kWh) = Power (kW) * Time (hours) = 0.4 kW * 300 hours = 120 kWh. The cost of energy is \u20b9 3.00 per kWh. Total cost = Energy consumed * Cost per kWh = 120 kWh * \u20b9 3.00\/kWh = \u20b9 360. Energy consumed is calculated as Power (in kW) multiplied by Time (in hours). The total cost is the energy consumed multiplied by the rate per unit of energy (kWh).","og_url":"https:\/\/exam.pscnotes.com\/mcq\/an-electric-refrigerator-rated-400-w-operates-10-hours-day-what-is-th\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T11:32:45+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/an-electric-refrigerator-rated-400-w-operates-10-hours-day-what-is-th\/","url":"https:\/\/exam.pscnotes.com\/mcq\/an-electric-refrigerator-rated-400-w-operates-10-hours-day-what-is-th\/","name":"An electric refrigerator rated 400 W operates 10 hours\/day. What is th","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T11:32:45+00:00","dateModified":"2025-06-01T11:32:45+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"The power rating of the refrigerator is 400 W, which is equal to 0.4 kW (since 1 kW = 1000 W). The refrigerator operates for 10 hours per day. Over 30 days, the total operation time is 10 hours\/day * 30 days = 300 hours. The total energy consumed is the power multiplied by the time: Energy (kWh) = Power (kW) * Time (hours) = 0.4 kW * 300 hours = 120 kWh. The cost of energy is \u20b9 3.00 per kWh. Total cost = Energy consumed * Cost per kWh = 120 kWh * \u20b9 3.00\/kWh = \u20b9 360. Energy consumed is calculated as Power (in kW) multiplied by Time (in hours). The total cost is the energy consumed multiplied by the rate per unit of energy (kWh).","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/an-electric-refrigerator-rated-400-w-operates-10-hours-day-what-is-th\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/an-electric-refrigerator-rated-400-w-operates-10-hours-day-what-is-th\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/an-electric-refrigerator-rated-400-w-operates-10-hours-day-what-is-th\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"UPSC CISF-AC-EXE","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/upsc-cisf-ac-exe\/"},{"@type":"ListItem","position":3,"name":"An electric refrigerator rated 400 W operates 10 hours\/day. 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