<text><span class="style10">lectricity in Action (6 of 6)</span><span class="style7"></span><span class="style10">TRANSFORMERS</span><span class="style7"> If two insulated coils of wire are wound on the same soft iron core and an alternating current is passed through one of the coils, a current will be induced in the other coil. The ratio of the numbers of turns on the input coil (N1) and the output coil (N2) will determine the ratio of the output voltage (V2) to the input voltage (V1). The relationship is: V2 N2--- = ---- V1 N1 In this way transformers can either step voltage up or step it down. Note that they have the reverse effect on current. This principle is used for efficient long-distance power transmission.</span></text>
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<id>23</id>
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