ELECTRICITY AND CIRCUITS | Study

Electricity | Speed Notes

Notes For Quick Recap

Electric Circuit: Connecting wires, bulb, switch and electric cell is used in Torch, Battery, LED (Light Emitting Diode), etc.

Electric current is carried by Conductor.

Conductor: Materials that allow electic current to pass through them.

All metals are good conductors of electricity. Carbon is the only non-metal which is a good conductor of electricity.

Electric current is stopped by Insulators.

Insulators: Materials which do not allow electric current to pass through them.

Example: Plastic, rubber, wood, glass, polythene, PVC, etc.

Electricity can give us magnetism

Electricity is a form of energy which helps us with, heating effect, light effect , and magnetic effect.

:- It is a flow of electic current.

SOURCES OF ELECTRICAL ENERGY :- Electrical energy is available to us from electric power houses,domestic generators, batteries, and dry cells. (Scroll down to continue …)

Electric Current :- The Electic current is a flow of elcetric charges ( electron ). Electric current flows in one direction only.

Electric Circuit: The complete ath from one terminal of the cell ( say positive ) through the bulb and back to the other terminal of the cell ( say negative ) is calle an electric circuit .

CLOSED CIRCUIT :- An unbroken path travelled by electrIcity is known as a CLOSED CIRCUIT.

OPEN CIRCUIT :- A broken path is known as an OPEN CIRCUIT.

Circuit Diagram: It is a symbolic representation of the electric circuit and the electrical parts (electrical components).

Component of Electricity:

Connecting wires: Help to conduct the electric current and complete the circuit. A metalic wire used for connections in an circuit is also called a ‘lead’.

Bulb: Lights up when an electric current flows through it. An electric bulb has a filament that is connected to its terminals. An electric bulb glows when electric current passes through it. The filament of an electric bulb is made of a tiny , coiled tungsten wire.

Battery :- A series combination of two or more cells.

Switch: Switch is a simple device that is used to either break the electric circuit or to complete it. When a switch is on, a gap in the circuit is bridge by a conducting material through which the current flows.

Electric cell or dry cell : An electric cell has two terminals; one is called positive (+ ve) while the other is negative (– ve).Inside the electric cell the electric charges flows from

negative (- ive ) terminal to the positive ( + ive ) terminal.