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Our teacher told us to find out the time period and then multiply it by 18.Then 180-(∆t*18) gives firing angle.Why 18 as a multiplier?

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  • \$\begingroup\$ VTC - Vote to close as this posting lacks clarity and completeness so as to be next to impossible to scare up any type of answer, \$\endgroup\$ – Michael Karas Feb 13 '17 at 1:42
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It would help if you had some dimensional analysis in there.

Presumably (though you didn't bother filling in your profile so it's hard to tell) you're in a 50Hz country, so each half-cycle is 180 degrees and 10 milliseconds. Hmmm.. 180°, 10ms ... anything we could do with those? Maybe to find °/ms?

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