Download A Field Guide to Household Technology by Ed Sobey PDF

By Ed Sobey

Illustrating how a fireplace alarm detects smoke and what the “plasma” is in a plasma monitor tv, this interesting instruction manual explains how daily family units functionality and function. greater than a hundred and eighty various family applied sciences are coated, together with devices designated to house structures and houseboats. units are grouped in line with their "habitats"—the front room, kin room, den, bed room, kitchen, toilet, and basement—and function a detailed description of what the gadget does and the way it really works, in addition to a photo for simple id. With necessary sidebars describing comparable technical concerns, corresponding to why an inexpensive dimmer swap can intervene with radio reception, this guide for curious readers offers rigorously specific descriptions and the background at the back of a few of the older family applied sciences like toasters and taps to more recent applied sciences like movement detectors, TiVo, and satellite tv for pc radio.

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The alarm sounds when a detector senses a change in the color of a gel-coated disc, which is caused by the presence of carbon monoxide. Also battery powered, electrochemical alarms go off when carbon monoxide generates an electric current through a chemical reaction with platinum oxide. Carbon monoxide is the leading cause of accidental poisoning deaths in America. Since the gas is invisible, odorless, and tasteless, detectors are the only way you will know that levels are unsafe. This gas is less dense than air, but mixes readily due to convection currents.

Older models have analog clocks and operate mechanically: gears rotate with the clock mechanism and trip a switch to turn off the radio (slumber mode) or turn it on (alarm mode). Newer models have digital displays and electronic circuits to control the alarm, various sounds, and the radio. B E D RO O M 63 Emergency Radio B E H AV I O R Provides information (and music) from radio stations when other radios don’t have power to operate. H A B I TAT Kept in closets or drawers until the “no-battery, no-power” emergency hits.

If your sound system has a bass adjustment, turn the bass way up to feel the vibrations even more. Most speakers have an electromagnet that vibrates as the radio signal changes. The electromagnet moves a diaphragm made of paper. As the diaphragm moves in and out, it moves air molecules at the speed of sound and creates sounds. Thus the speaker converts electrical signals into signals we can hear. L I V I N G RO O M , FA M I LY RO O M , A N D D E N 49 Phonograph (Record Player) B E H AV I O R Reads the etchings in vinyl disks (records) and converts them into electrical signals that can be amplified and heard as music and other sounds.

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