# AP Board 7th Class Science Notes Chapter 7 Electricity – Current and Its Effect

Students can go through AP State Board 7th Class Science Notes Chapter 7 Electricity – Current and Its Effect to understand and remember the concept easily.

## AP State Board Syllabus 7th Class Science Notes Chapter 7 Electricity – Current and Its Effect

→ The dry cell converts chemical energy into electrical energy.

→ Symbols play an important role in our life.

→ Symbols convey precise meaning with few descriptions.

→ The switch can be placed anywhere in the circuit.

→ In a series circuit, electricity has only one path to flow through.

→ A parallel circuit has more than one path for the flow of electricity.

→ Connecting small cells in series, we get a battery.

→ In a series connection of bulbs, if one bulb gets fused, all the other bulbs in the series will stop glowing.

→ All components in our houses are connected in parallel.

→ The filament of the bulb heats up due to the current flowing through it.

→ An electric iron, electric cooker, and electric heater contain a coil of wire made up of Nichrome.

→ This Nichrome is called the filament of the appliance.

→ The wires used for making electric circuits do not normally become hot.

→ Wastage of electricity can be reduced by using fluorescent tube lights in place of bulbs. Miniature Circuit Breakers (MCB) are increasingly being used in place of fuses.

→ 1 kilowatt (KW) is 1000 watts (W).

→ An electric cell is a source of electric energy.

→The two terminals of an electric cell are called positive (+ve) and negative (-ve).

→ The battery cells in the torchlight are kept in series.

→ An electric bulb has a filament that is connected to its terminals.

→ An electric bulb glows when an electric current passes through it.

→ In a closed electric circuit, the electric current passes from one terminal of the electric cell to the other terminal.

→ The switch is a single device that is used either to break the electric circuit or to complete it.

→ The safety device used in, an electric circuit is a fuse.

→ Cell: A single unit for electrolysis or conversion of chemical into electric energy, usually consisting of a container with electrodes and an electrolyte; a battery also called electrochemical cell.

→ Battery: Two or more connected cells that produce a direct current by converting chemical energy to electrical energy.

→ Fuse: Safety device used in an electric circuit.

→ Serles circuit: An electric circuit connected so that current passes through each circuit element in turn without branching.

→ Parallel circuit: Circuits in which a power source is directly connected to two or more components are called parallel circuits.

→ Bulbs in series: A number of bulbs arranged or coming one after the other in succession.

→ Bulbs in parallel: A number of bulbs arranged directly.

→ Tube light: A lamp that produces visible light by fluorescence, especially a glass tube whose inner wall is coated with a material that fluoresces when an electrical current causes a vapor within the tube to discharge electrons.

→ Compact fluorescent Lamps: CFLs use less power and have a longer rated life,

→ Miniature Circuit Breaker: A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by overload or a short circuit. Its basic function is to detect a fault condition and, by interrupting continuity, to immediately discontinue electrical flow.
Unlike a fuse.

→ Watt: An International System unit of power equal to one joule per second.

→ Circuit diagram: A schematic drawing of the wiring of an electrical system

→ Heating effect of current: Electrical energy converts into heat energy by a specialized device.

→ Switch: A device used to either break the circuit or to complete it.