Answered: 39. How long would it take 0.5 M2 of…

39. How long would it take 0.5 M2 of resis- tance to dissipate 1000 joules of heat if the current in the resistance is 20 µA ? (i) 5 x 10°s (ii) 2.5 x 10°s (iii) 7.5 x 106s (iv) 5.5 x 106s

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter25: Surge, Spike, And Lightning Protection

Section: Chapter Questions

Problem 4RQ: If a voltage spike lasts for 1.5 nanoseconds, what is the frequency of the spike?

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Concept explainers

Electrical Heating Unit

The conversion of electrical energy to heat energy is known as electric heating. The heating system that converts the electrical energy to heat energy for various application is called electrical heating unit. Electricity is employed as the firing mechanism in electric heating systems, which transforms electric current to heat. Electric heaters have heating elements in the form of electric resistors.

Question

39. How long would it take 0.5 M2 of resis-
tance to dissipate 1000 joules of heat if the
current in the resistance is 20 µA ?
(i) 5 × 10° s
(ii) 2.5 x 10° s
(iii) 7.5 × 106s
(iv) 5.5 x 10° s

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