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Student & Learning Zone - City & Guilds
Revision - Transformers
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 316731" data-attributes="member: 250"><p>Correct... you just need to remember that....</p><p></p><p>Voltage Primary/Voltage Secondary = No Of Turns Primary/No Of Turns Secondary = Current Secondary/Current Primary..</p><p></p><p>So whatever values you are given use and transpose the bits accordingly..</p><p></p><p>BUT don't forget that the current ratio is arse about face to the others.. i.e Secondary<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick out tongue :p" loading="lazy" data-shortname=":p" />rimary not Primary:Secondary.</p><p></p><p>Bottom line is (excluding small losses) the transformer does not generate or consume any power,</p><p></p><p>so if the Voltage goes down.. the current must go up.. so V*I remains equal on both sides..</p><p></p><p>(thats why need care with conductor sizes on low voltage lighting as 50W @ 230V = 0.2A ish </p><p></p><p>but 50W @ 12v = 4A ish)</p><p></p><p> Guinness</p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 316731, member: 250"] Correct... you just need to remember that.... Voltage Primary/Voltage Secondary = No Of Turns Primary/No Of Turns Secondary = Current Secondary/Current Primary.. So whatever values you are given use and transpose the bits accordingly.. BUT don't forget that the current ratio is arse about face to the others.. i.e Secondary:Primary not Primary:Secondary. Bottom line is (excluding small losses) the transformer does not generate or consume any power, so if the Voltage goes down.. the current must go up.. so V*I remains equal on both sides.. (thats why need care with conductor sizes on low voltage lighting as 50W @ 230V = 0.2A ish but 50W @ 12v = 4A ish) Guinness [/QUOTE]
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