Students can go through AP Board 7th Class Science Notes 6th Lesson Electricity to understand and remember the concept easily.
AP Board 7th Class Science Notes 6th Lesson Electricity
→ A cell is a device used to generate electricity.
→ Cell mainly consists of two components, electrolyte, and electrodes.
→ Electrolyte is a chemical component that conduct the electricity.
→ Electrodes are two types : positive and negative.
→ The positive electrode is called anode.
→ The negative electrode is called cathode.
→ Cell converts the chemical energy into electrical energy.
→ A group of cells is called a battery.
→ There are different types of electrical cells such as dry cell, lithium cell, button cell, alkaline cell etc.
→ Dry cells are used in torch lights, wall clocks, radios etc.
→ Lithium ion cells are rechargeable and used in mobile phones, laptops etc.
→ Switch is used to open or close a circuit.
→ Incandescent, fluorescent, CFL, LED bulbs etc. are different types of bulbs.
→ Electrical fuse is a safety device which is used to protect the electrical appliances from excess of electricity flow through them.
→ Miniature Circuit Breaker (MCB) is being used in place of electric fuses.
→ A simple electric circuit consisting of a battery, a bulb, a switch and connecting wires.
→ The diagrams which show the arrangement of electric component’s in a circuit are called circuit diagrams.
→ The common sequence of components in electric circuit diagram is as follows :
→ Positive terminal of. the cell → wire bulb wire → switch → wire → negative terminal of the cell.
→ If the second terminal of the first device is connected to the first end of the second device such type of connection is called series connection.
→ If all the first terminals of all the devices are connected to one point and all the second terminals are connected to another point such type of connection is called parallel connection.
→ If a number of cells are connected in series the brightness of the bulb is enhanced. If one of the cells is removed, the circuit becomes open and the bulb will not glow.
→ If a number of cells are connected in parallel the brightness of the bulb remains same. Even if one of the cells is removed, the circuit remains same arid the bulb will glow as usual.
→ We can use series connection of cells in torch light, toys, remotes, wall clocks etc.
→ We can use parallel connection of cells for a long-lasting battery life.
→ The production of heat due to the flow of electricity through a wire is called ’Heating’ effect of electricity’.
→ Electric stove, electric room heater, electric iron box, electric kettle etc. are working on the principle of heating effect of electricity.
→ The coil of wire inside the above devices is called a filament which produces heat.
→ Generally a filament is made up of Nichrome.
→ The filament of an electric bulb, is made of Tungesten.
→ The production of nlagnetic force due to the flow of electricity through a wire is called magnetic effect of electricity.
→ The devices which act as magnets when electricity passes through them are called electromagnets.
→ Magnetic effects produced in a coil due to the passing of electricity in the coil is called magnetic effect of electricity.
→ Electric fan, electric bell, electric motor are working on the principle of magnetic effect Of electricity.
→ 1 kilo watt = 1000 watts.
→ 1 KWH = 1 unit of electricity
→ Electricity supplied to our houses comes from power stations and substations.
→ An electric shock occurs when a person comes into contact with an electrical source.
→ Electricity flows through a portion of the body causing a shock.
→ The ISI mark ensures the quality of appliances and safety of users.
→ cell : Electrical cell is a source of electric energy, (or) A cell is a device used to generate electricity.
→ Bulb : Bulb is a light source which converts electrical energy into light energy.
→ Battery : A group of cells is called a battery, (or) Battery is a source of electric energy.
→ Fuse : The safety device which is used in electrical appliances to protect from damages when excess of electricity flows through them is called a electric fuse.
→ Series : If the second terminal of the first device is connected to the first end of the second device such type of connection is called series connection.
→ Parallel : If all the first terminals of all the devices are connected to one point and all the second terminals are connected to another point such type of connection is called parallel connection.
→ Heating effect : The production of heat due to the flow of electricity through a wire is called heating effect of electricity.
→ Magnetic – effect : The production of magnetic force due to the flow of electricity through a wire is called magnetic effect of electricity.
→ Electromagnet : The devices which act as magnets when electricity passes o through them are called electromagnets.
→ MCB : Miniature Circuit Breaker isNa type of fuse which automatically turns off when electricity in a circuit exceeds the safe limit.
→ Electric shock : An electrit shock occurs when a person comes into contact with an electrical source and electricity flows through his body.
→ Fluorescent tube : Fluorescent tube light is a light source, which is commonly known as tube light.
→ CFL : Compact Fluorescent Lamp is a light source.
