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Ohm''s Law - Engineering

Q1:

What is the approximate resistance setting of a rheostat in which 650 mA of current flows with a 150 V source?

A 9.7 

B 97 

C 23 

D 230 

ANS:D - 230 

Given I= 650 mA =0.65Amp.
V= 150 V.

req = R?
Solution R = V/I = 150v/0.65Amp = 230.769.