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A watch uses energy at the rate of 250 micro W. How much current does it draw from its 1.5 V...

Question:

A watch uses energy at the rate of {eq}\rm 250 \ \mu W {/eq}. How much current does it draw from its 1.5 V battery?

Electric Power

Electric power is the rate at which energy is used or dissipated by an electrical element.

It is equal to the product of current through the element and potential difference across the element.

Answer and Explanation: 1

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Electric power of an electrical element is given by

{eq}P= Vi {/eq}

Where

  • P is power
  • V is the potential difference
  • i is the current

Thus...

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Calculating Energy & Power in Electric Circuits

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Chapter 14 / Lesson 4
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Learn about energy and power in an electric circuit. Understand the electrical energy formula and how to calculate electrical power in an energy circuit.


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