A 12 V battery is connected across a device whose resistance is 24 ohms. What is the power of this load?

A 12 V battery is connected across a device whose resistance is 24 ohms. What is the power of this load?

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Answer

• 6 watts
  Explanation:
  Use Ohm’s Law V = IR
  V = 12V
  I = I
  R = 24 ohms
  Rearrange the equation to solve for I to get
  V / R = I
  12 / 24 = 0.5 amps
  To find power
  P = V I
  6 watts

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