{"id":4975,"date":"2020-05-14T07:00:00","date_gmt":"2020-05-14T11:00:00","guid":{"rendered":"https:\/\/langa.com\/?p=4975"},"modified":"2020-05-22T10:31:12","modified_gmt":"2020-05-22T14:31:12","slug":"computers-have-an-internal-battery-for-the-clock-to-keep-it-running-even-when-the-computer-has-no-power-why-do-stoves-not-have-this-feature","status":"publish","type":"post","link":"https:\/\/langa.com\/index.php\/2020\/05\/14\/computers-have-an-internal-battery-for-the-clock-to-keep-it-running-even-when-the-computer-has-no-power-why-do-stoves-not-have-this-feature\/","title":{"rendered":"“Computers have an internal battery for the clock to keep it running even when the computer has no power. Why do stoves not have this feature?”"},"content":{"rendered":"\n

(Answer requested by Reese Horn)<\/small><\/em><\/p>\n\n\n\n

The batteries in PC aren’t just for the internal clock; that tiny trickle of power also helps the turned-off PC to “remember” some basic information about its hardware components, so it will know what to do right away, when the power comes on.<\/p>\n\n\n\n

If the PC “forgets” this information (such as when the battery dies), the PC will be much slower to start up — and also will need to be told what time it is, once it’s back up and running.<\/p>\n\n\n\n

Kitchen appliances have traditionally been “dumb” devices; with clocks that were either ornamental, or were present only to perform simple meal-prep timing functions. A power outage never affected the subsequent basic functions of the appliance — an oven heated exactly the same after a power outage as it did before — so there was little value in making the clock outage-proof.<\/p>\n\n\n\n

Appliances are more complex today, and many routinely incorporate a halfway measure in the form of a large capacitor somewhere in the circuitry; this stores a small electrical charge that can carry the clock and related circuitry through a second or two of power-out. This doesn’t help in an extended outage, of course, but keeps the clock and circuitry alive through minor electrical blinks and glitches. This is a convenience, but not actually necessary, as the appliance still would work exactly the same — no operational change, no data loss — before and after.<\/p>\n\n\n\n

IOT and “smart” appliances are a whole ‘nother thing: With elaborate setups, logons, and programming, there’s a lot more to lose in a power outage. So yes, they should either have some kind of internal power supply, or nonvolatile<\/em> memory (that does not need constant electrical refreshing), so that you won’t have to set the thing up from scratch every time the power flickers!<\/p>\n\n\n\n

Permalink: https:\/\/langa.com\/?p=4975<\/a><\/strong><\/em><\/p>\n\n\n\n

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(Answer requested by Reese Horn) The batteries in PC aren’t just for the internal clock; that tiny trickle of power also helps the turned-off PC to “remember” some basic information about its hardware components, so it will know what to do right away, when the power comes on. If the PC “forgets” this information (such…<\/p>\n","protected":false},"author":1,"featured_media":4989,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[7,30],"tags":[],"class_list":["post-4975","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-a-reader-asks","category-hardware"],"aioseo_notices":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/langa.com\/wp-content\/uploads\/2020\/05\/change-date-and-time.jpg?fit=300%2C156&ssl=1","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paaiox-1if","jetpack-related-posts":[{"id":167,"url":"https:\/\/langa.com\/index.php\/2018\/08\/23\/a-reader-asks-is-there-a-hidden-timer-on-the-mainboard-yes\/","url_meta":{"origin":4975,"position":0},"title":"A reader asks: Is there a hidden timer on the mainboard? (Yes!)","author":"Fred Langa","date":"2018-08-23","format":false,"excerpt":"Q:\u00a0 \"Is there a timer on the motherboard after the PC has been completely drained of power?\" (via Quora) \u00a0A:\u00a0Yes, usually. \u00a0Many systems have a small cell or battery on the mainboard to\u00a0power\u00a0a few basic, internal housekeeping functions. 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