A certain sample carries a current of 4 A when the potential difference is

R

Rob

New member
2 V and a current of 10 A when...? the potential differences is 4 V. This sample:

A) obeys Ohms law
B) has a resistance of 0.5 ohms at 1 V
C) has a resistance of 2.5 ohms at 2 V
D) has a resistance of 25 ohms at 2 V
E) does not have a resistance

please explain
 
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