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Test # 181 [29-Dec-2017]


1.
The angry boatsman threw (a) the cracked oar (b) / in the river (c) and returned home. (d) / No error (e)

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151 [29-Nov-2017] 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 [14-Dec-2017] 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 [29-Dec-2017] 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 [13-Jan-2018] 197 198 199 200
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  • Simple Science

    Electric Stoves

    Some Uses of Electricity:
    It is often desirable to utilize the electric current for the production of heat. For example, trolley cars are heated by coils of wire under the seats. The coils offer so much resistance to the passage of a strong current through them that they become heated and warm the cars.

    Some modern houses are so built that electricity is received into them from the great plants where it is generated, and by merely turning a switch or inserting a plug, electricity is constantly available. In consequence, many practical applications of electricity are possible, among which are flatiron and toaster.

    Within the flatiron, is a mass of fine wire coiled as shown in Figure; as soon as the iron is connected with the house supply of electricity, current flows through the fine wire which thus becomes strongly heated and gives off heat to the iron. The iron, when once heated, retains an even temperature as long as the current flows, and the laundress is, in consequence, free from the disadvantages of a slowly cooling iron, and of frequent substitution of a warm iron for a cold one. Electric irons are particularly valuable in summer, because they eliminate the necessity for a strong fire, and spare the housewife intense heat. In addition, the user is not confined to the laundry, but is free to seek the coolest part of the house, the only requisite being an electrical connection.

    The toaster is another useful electrical device, since by means of it toast may be made on a dining table or at a bedside. The small electrical stove, shown in Figure, is similar in principle to the flatiron, but in it the heating coil is arranged as shown in Figure. To the physician electric stoves are valuable, since his instruments can be sterilized in water heated by the stove; and that without fuel or odor of gas.

    A convenient device is seen in the heating pad, a substitute for a hot water bag. Embedded in some soft thick substance are the insulated wires in which heat is to be developed, and over this is placed a covering of felt.

    FIG. - An electric iron on a metal stand.

    FIG. - The fine wires are strongly heated by the current which flows through them.

    FIG. - Bread can be toasted by electricity.

    FIG. - An electric stove.

    FIG. - The heating element in the electric stove.

    FIG. - An electric pad serves the same purpose as a hot water bag.


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