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A current of 0.5 ampere flows through a resistor when 12 volt is applied. The value of the resistor is:

  a.   6 ohms

  b.   12.5 ohms

  c.   17 ohms

  d.   24 ohms
Your answer "a" is not correct. "d" is the right answer.

R = E / I
= 12 / 0.5
= 24 ohms.

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