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An electric heater draws 3.5 A from a 110 V source. The resistance of the heating element is approximately?

A.385 ohm B.38.5 ohm C.3.1 ohm D.31 ohm

Electrical Engineering
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Question added by Naif Ali Zamzami , Cost Engineer , Yanbu Aramco Sinopec Refining Company (YASREF) Ltd
Date Posted: 2014/05/30
Upvote (0) Views (27) Followers (3) Answers (6) Report Question
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Anas Abbadi
by Anas Abbadi , Controls Team Supervisor , SESAME (Synchrotron-light for Experimental Science and Applications in the Middle East)

With heating elements PF=~1

and we know from ohm's law 

V=I*R

R=V/I

so R=110/3.5

=31.43 Ohm

Murtuza Challawala
by Murtuza Challawala , Contract Administrator , Bader Al Mulla & Bros. Co.

D

Salvador Herrero
by Salvador Herrero , Production Manager at Haramain Railway Project , EYM Instalaciones (OHL Group)

C or D are valid in case monophase supply.

Asmaa Mahmoud
by Asmaa Mahmoud , Fire Fighting Engineer , Alkhadiya Combined Company for general contracting for buildings

31 ohms

mohamed gamal
by mohamed gamal , deputy managing director , Jac

C

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