define electric current of chapter 11th explanatio
Answers
- An electric current is a flow of particles (electrons) flowing through wires and components.
- It is the rate of flow of charge. If the electric charge flows through a conductor, we say that there is an electric current in the conductor.
- In the circuits using metallic wires, electrons constitute a flow of charges.
Topics under Electricity
- Electric Potential and Potential Difference
- Ohm’s Law and Resistance
- Heating Effect of Electric Current and Its Applications
Electric Current Formula and Unit
- The conventional direction of electric current is taken as opposed to the direction of flow of electrons.
- If a charge Q flows through the cross-section of a conductor in time t, the current I then I=Q/t.
- The S.I unit of charge is coulomb and measurement of electric current happens in units of coulomb per second which is ‘ampere’.
- The current flows from the negative terminal to the positive terminal of the cell.
⚡An electric current is a flow of electric charge in a circuit.
⚡More specifically, the electric current is the rate of charge flow past a given point in an electric circuit.
⚡The charge can be negatively charged electrons or positive charge carriers including protons, positive ions or holes.
⚡The direction of an electric current is by convention the direction in which a positive charge would move.
⚡Thus, the current in the external circuit is directed away from the positive terminal and toward the negative terminal of the battery.
⚡Electrons would actually move through the wires in the opposite direction.
⚡The ampere, symbol A, is the SI unit of electric current.
⚡Electric current relates the electric charge and the time.
⚡ According to Ohm's law, the electric current formula will be,