Lesson Notes
Electric Current and Its Effects
Electric Current:
The flow of electric charge is called electric current.
In an electric circuit, the charge is often carried by moving electrons.
The SI unit of electric current is Ampere (A).
The SI unit of electric charge is Coulomb.
Electric Circuit:
The path through which electric charge moves is called electric circuit.
Symbols in Electric Circuit:
Different components of electric circuit are shown by certain symbols.
Use of symbols makes it easy to represent an electric circuit. Use of standard symbol makes it easy to understand for anybody.
For example; a TV mechanic can identify different components of a TV by looking at its circuit diagram.
Electric Cell: It is a device which produces electric charge because of some chemical reactions.
The cell which is used in a torch is called dry cell.
The wet cells are used in car batteries.
A normal dry cell gives an output of 1.5 Volt (V).
Battery: A group of cells is called battery.
More than one cell is used in most of the devices; because these devices need more than 1.5 V of power.
Closed Circuit: When the circuit is complete, it is called closed circuit. Current flows only in a closed circuit.
Open Circuit: When the circuit is incomplete, it is called open circuit. Current does not flow in an open circuit.
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