Robert uses an old ammeter to measure the current flowing through a section of a circuit he has built. His computer has correctly determined that the actual current is 323 milliamperes, but the ammeter is showing that the current is 347 milliamperes. What is the percent error of the ammeter reading?

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Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.