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Electricity is the set of physical phenomenon associated with the presence and motion of matter that has a property of electric charge . In early days, electricity was considered as being not related to magnetisem . Later on, many experimental results and the development of Maxwell's equations indicated that both electricity and magnetism are from a single phenomenon: electromagnetism . Various common phenomena are related to electricity, including ligthting , static electricity , electric heating , electric discharge and many others. Parallel Series voltage, electric potential difference , electric pressure or electric tension is the difference in electric potential between two points. In the international system of unit...