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« B         Main » Electricity » Current & Potential Difference » Lesson III.2.1   ### Charge - Lesson III.2.1

 Key Terms: elementary charge | fundamental law of electric charge | Ordinary matter is made up of atoms which have positively charged nuclei and negatively charged electrons surrounding them. The magnitude of the charge on one proton or electron is called the elemenary charge "e". Charge is quantized as a multiple of the electron or proton charge: proton charge: e=1.602 x 10-19 Coulombs electron charge: e=-1.602 x 10-19 Coulombs One coulomb (C) of charge represents an excess or deficit of 6.24 x 1018 electrons.

The quantity of charge (Q) on an object is equal to the number of elementary chages on the object (N) multiplied by the elementary charge (e).

Q = Ne

Example 1:

How much charge does the capacitor hold if it has 4.5 billion elemenatary charges?

Example 2:

If an object has 4 coulombs of charge stored, how many elementary charges are present?

 Fundamental Law of Electric Charge: Opposite electric charges attract each other. Similar electric charges repel each other. Charged object attract some neutral object.         