The expression 0.01E + 0.003E2 gives the thickness in millimeters (mm) of the insulation needed for a high voltage cable. E is the number of kilovolts carried by the cable. What thickness of insulation material is needed for 5 kilovolt cable?

Question

Mathematics

Keegan Kirk

17 October, 06:50

The expression 0.01E + 0.003E2 gives the thickness in millimeters (mm) of the insulation needed for a high voltage cable. E is the number of kilovolts carried by the cable. What thickness of insulation material is needed for 5 kilovolt cable?

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Answers (1)

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Josephine Middleton · Answer 1

The thickness is given by

t = 0.01E + 0.003E² mm

where

E = kilovolts

For a 5 kilovolt cable, set E to 5 to obtain

t = 0.01*5 + 0.003*5²

= 0.05 + 0.075

= 0.125

Answer: 0.125 mm