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If a 12 volt battery supplies 0.15 ampere to a circuit, the circuit's resistance is:

  a.   0.15 ohm

  b.   1.8 ohm

  c.   12 ohm

  d.   80 ohm
Your answer "c" is not correct. "d" is the right answer.

R = E / I
= 12 / 0.15
= 80 ohms

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