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DP 1-1 A particular circuit element is available in three grades. Grade
A guarantees that the element can safely absorb 1/2 W continuously.
Similarly, Grade B guarantees that 1/4 W can be absorbed safely and Grade C
guarantees that 1/8 W can be absorbed safely. As a rule, elements that can
safely absorb more power are also more expensive and bulkier. |
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The
voltage across an element is expected to be about 20
V and the current in the element is expected to be about 8 mA. Both estimates
are accurate to within 25 percent. The voltage and current reference adhere
to the passive convention. |
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Specify the grade of this element. Safety is the most important consideration, but don’t specify an element that is more expensive than necessary. |
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P = iV,
so use the largest possible V and i will give the
largest possible P. The largest V and i will result from being 1.25 times the nominal value. |
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