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Electricity Notes Part I An is a property that causes subatomic particles, such as , to attract and repel one another. There are two types of electric charge – positive and negative Protons have the charge and electrons have a charge. Atoms are because they have the same number of protons and electrons. An excess or shortage of electrons produces a net electric charge. The SI unit of electric charge is the (C). 6.24 X 1018 electrons are needed to produce 1 coulomb of electric charge. A lightning bolt has 10-20 coulombs of charge. An is the force of attraction or repulsion between electrically charged objects. Like charges and opposite charges If the electric charge on an object is . , the electric force is . If the distance between two objects is , the electric force is . An charges in the space around it. is the effect an electric charge has on other The strength of an electric field depends on the amount of the field and on the that produces from the charge. An electric field exerts a force on any charged object placed in the field. is the study of the behavior of electric charges, including how charge is transferred between objects. states that the total charge in an isolated system is constant. Charge can be transferred by friction, by contact, and by induction. : When friction happens between objects, electrons will move from one object to the other because one has a attraction for electrons than the other. : When charged objects come in contact with one another, charge can be . : Induction is the transfer of charge contact between materials. occurs when a pathway through which charges can move forms suddenly.