{"id":85339,"date":"2025-06-01T03:12:40","date_gmt":"2025-06-01T03:12:40","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=85339"},"modified":"2025-06-01T03:12:40","modified_gmt":"2025-06-01T03:12:40","slug":"a-100-w-electric-bulb-is-used-for-10-hours-a-day-how-many-units-of-el","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/a-100-w-electric-bulb-is-used-for-10-hours-a-day-how-many-units-of-el\/","title":{"rendered":"A 100 W electric bulb is used for 10 hours a day. How many units of el"},"content":{"rendered":"

A 100 W electric bulb is used for 10 hours a day. How many units of electrical energy are consumed by the bulb in 3 days? (1 unit = 1 kWh)<\/p>\n

[amp_mcq option1=”3.00″ option2=”1.08″ option3=”2.16″ option4=”0.33″ correct=”option1″]<\/p>\n

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This question was previously asked in<\/div>\n
UPSC CDS-1 – 2023<\/div>\n<\/div>\n
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\nThe energy consumed by an electrical appliance is calculated by multiplying its power rating by the time it is used.
\nPower (P) = 100 W.
\nTime used per day = 10 hours.
\nTotal time used in 3 days = 10 hours\/day \u00d7 3 days = 30 hours.
\nEnergy consumed (in Watt-hours) = P \u00d7 Time = 100 W \u00d7 30 hours = 3000 Wh.
\nTo convert Watt-hours to kilowatt-hours (units), divide by 1000:
\nEnergy consumed (in kWh) = 3000 Wh \/ 1000 Wh\/kWh = 3 kWh.
\nSince 1 unit = 1 kWh, the energy consumed is 3 units.
\n<\/section>\n
\nElectrical energy consumed is calculated as Power \u00d7 Time. Energy unit (kWh) = Power (kW) \u00d7 Time (h).
\n<\/section>\n
\nElectricity meters in homes measure energy consumption in kilowatt-hours (kWh), which are commonly referred to as ‘units’. The cost of electricity is usually charged per unit consumed.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

A 100 W electric bulb is used for 10 hours a day. How many units of electrical energy are consumed by the bulb in 3 days? (1 unit = 1 kWh) [amp_mcq option1=”3.00″ option2=”1.08″ option3=”2.16″ option4=”0.33″ correct=”option1″] This question was previously asked in UPSC CDS-1 – 2023 Download PDFAttempt Online The energy consumed by an … <\/p>\n

Detailed SolutionA 100 W electric bulb is used for 10 hours a day. How many units of el<\/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":[1087],"tags":[1105,1201,1128],"class_list":["post-85339","post","type-post","status-publish","format-standard","hentry","category-upsc-cds-1","tag-1105","tag-electric-current","tag-physics","no-featured-image-padding"],"yoast_head":"\nA 100 W electric bulb is used for 10 hours a day. How many units of el<\/title>\n<meta name=\"description\" content=\"The energy consumed by an electrical appliance is calculated by multiplying its power rating by the time it is used. Power (P) = 100 W. Time used per day = 10 hours. Total time used in 3 days = 10 hours\/day \u00d7 3 days = 30 hours. Energy consumed (in Watt-hours) = P \u00d7 Time = 100 W \u00d7 30 hours = 3000 Wh. To convert Watt-hours to kilowatt-hours (units), divide by 1000: Energy consumed (in kWh) = 3000 Wh \/ 1000 Wh\/kWh = 3 kWh. Since 1 unit = 1 kWh, the energy consumed is 3 units. Electrical energy consumed is calculated as Power \u00d7 Time. Energy unit (kWh) = Power (kW) \u00d7 Time (h).\" \/>\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\/a-100-w-electric-bulb-is-used-for-10-hours-a-day-how-many-units-of-el\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"A 100 W electric bulb is used for 10 hours a day. How many units of el\" \/>\n<meta property=\"og:description\" content=\"The energy consumed by an electrical appliance is calculated by multiplying its power rating by the time it is used. Power (P) = 100 W. Time used per day = 10 hours. Total time used in 3 days = 10 hours\/day \u00d7 3 days = 30 hours. Energy consumed (in Watt-hours) = P \u00d7 Time = 100 W \u00d7 30 hours = 3000 Wh. To convert Watt-hours to kilowatt-hours (units), divide by 1000: Energy consumed (in kWh) = 3000 Wh \/ 1000 Wh\/kWh = 3 kWh. Since 1 unit = 1 kWh, the energy consumed is 3 units. Electrical energy consumed is calculated as Power \u00d7 Time. Energy unit (kWh) = Power (kW) \u00d7 Time (h).\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/a-100-w-electric-bulb-is-used-for-10-hours-a-day-how-many-units-of-el\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T03:12:40+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":"A 100 W electric bulb is used for 10 hours a day. How many units of el","description":"The energy consumed by an electrical appliance is calculated by multiplying its power rating by the time it is used. Power (P) = 100 W. Time used per day = 10 hours. Total time used in 3 days = 10 hours\/day \u00d7 3 days = 30 hours. Energy consumed (in Watt-hours) = P \u00d7 Time = 100 W \u00d7 30 hours = 3000 Wh. To convert Watt-hours to kilowatt-hours (units), divide by 1000: Energy consumed (in kWh) = 3000 Wh \/ 1000 Wh\/kWh = 3 kWh. Since 1 unit = 1 kWh, the energy consumed is 3 units. Electrical energy consumed is calculated as Power \u00d7 Time. Energy unit (kWh) = Power (kW) \u00d7 Time (h).","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\/a-100-w-electric-bulb-is-used-for-10-hours-a-day-how-many-units-of-el\/","og_locale":"en_US","og_type":"article","og_title":"A 100 W electric bulb is used for 10 hours a day. How many units of el","og_description":"The energy consumed by an electrical appliance is calculated by multiplying its power rating by the time it is used. Power (P) = 100 W. Time used per day = 10 hours. Total time used in 3 days = 10 hours\/day \u00d7 3 days = 30 hours. Energy consumed (in Watt-hours) = P \u00d7 Time = 100 W \u00d7 30 hours = 3000 Wh. To convert Watt-hours to kilowatt-hours (units), divide by 1000: Energy consumed (in kWh) = 3000 Wh \/ 1000 Wh\/kWh = 3 kWh. Since 1 unit = 1 kWh, the energy consumed is 3 units. Electrical energy consumed is calculated as Power \u00d7 Time. Energy unit (kWh) = Power (kW) \u00d7 Time (h).","og_url":"https:\/\/exam.pscnotes.com\/mcq\/a-100-w-electric-bulb-is-used-for-10-hours-a-day-how-many-units-of-el\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T03:12:40+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\/a-100-w-electric-bulb-is-used-for-10-hours-a-day-how-many-units-of-el\/","url":"https:\/\/exam.pscnotes.com\/mcq\/a-100-w-electric-bulb-is-used-for-10-hours-a-day-how-many-units-of-el\/","name":"A 100 W electric bulb is used for 10 hours a day. 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Energy unit (kWh) = Power (kW) \u00d7 Time (h).","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/a-100-w-electric-bulb-is-used-for-10-hours-a-day-how-many-units-of-el\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/a-100-w-electric-bulb-is-used-for-10-hours-a-day-how-many-units-of-el\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/a-100-w-electric-bulb-is-used-for-10-hours-a-day-how-many-units-of-el\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"UPSC CDS-1","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/upsc-cds-1\/"},{"@type":"ListItem","position":3,"name":"A 100 W electric bulb is used for 10 hours a day. 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