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Electric Circuits, Resistance and Ohm s Law 1. The charge flowing through a conductor is called conventional current. 2. The electrons in a conductor move in a direction, opposite to the direction of charge. 3. The current due to moving electrons is called electronic current. 4. The unit of electric charge is coulomb. One coulomb is equivalent to 6.25 1018 electrons. 5. The charge on one electron is equivalent to 1.6 10 19C. 6. The rate of flow of charge is called electric current. 7. One ampere is the current when a charge of 1 coulomb flows through a conductor in one second. 8. Electric potential is the condition which determines the direction of the flow of charge. 9. Potential difference between two points in an electric circuit, is the amount of work done to move certain amount of charge from one point to another point. 10. Potential difference (V) = Work done (W) amount of charge (Q). 11. Potential difference is measured in volts. 12. One volt is the potential difference, if one joule of work is done in moving a charge of one coulomb. 13. An electric cell is a device, which maintains a constant potential difference across an electric circuit, by converting chemical energy to electric energy. Class-X 1 Key points
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