Sa3 - Science Practical (Year 5)

This symbol represents a battery. A battery is an electrical device that stores and provides electrical energy. It is commonly used as a power source in various electronic devices. The symbol consists of two parallel lines, with a longer line representing the positive terminal and a shorter line representing the negative terminal of the battery. This symbol is widely recognized and used in circuit diagrams to indicate the presence of a battery in an electrical circuit.

The needle is magnetic in nature because it contains iron, a magnetic material. Iron is attracted to magnets and can be magnetized itself. This allows the needle to interact with magnetic fields and be used in applications such as compasses or as a tool to test for magnetism. Wood, glass, and paper do not have magnetic properties and are not attracted to magnets.

A capacitor is not necessarily needed to construct a basic electric circuit. A basic circuit consists of a source (such as a battery or power supply), a load (such as a light bulb or resistor), and a switch to control the flow of electricity. A capacitor is an electronic component that stores electrical energy, but it is not essential for the functioning of a basic circuit.

If the switch is turned ON, it means that the circuit is complete and there is a continuous flow of electric current. This is known as a closed circuit. Therefore, the statement "If the switch is turned ON, it is called a closed circuit" is true.

An insulator is an object that does not allow electricity to flow through it. Unlike conductors, which allow the flow of electric charges, insulators have high resistance and prevent the movement of electrons. This property makes insulators useful for electrical insulation and safety purposes, as they help to minimize the risk of electric shock and short circuits.

The materials that are conductors of electricity are iron nail, copper wire, and water. Iron and copper are metals that have a high conductivity, allowing electric current to flow easily through them. Water can conduct electricity to some extent, especially if it contains impurities or dissolved ions that can carry the charge. On the other hand, rubber gloves and wood are insulators, meaning they do not allow the flow of electric current and instead resist its passage.

The statement "A cell is a collection of batteries" is false. A cell refers to a single unit of a battery that converts chemical energy into electrical energy. A battery, on the other hand, is made up of multiple cells connected in series or parallel to increase the overall voltage or capacity. Therefore, a cell is not a collection of batteries but rather a component of a battery.

The electron is a subatomic particle that has a negative charge and is found outside the nucleus of an atom. It revolves around the nucleus in specific energy levels or orbitals. This movement of electrons around the nucleus is essential for the stability and properties of atoms.

Like poles repel one another because they have the same type of charge. In physics, poles refer to the positive or negative ends of a magnet or an electric charge. According to the law of magnetism, like poles repel each other because the magnetic field lines generated by them push against each other. This phenomenon can also be observed with electric charges, where two positively charged objects or two negatively charged objects repel each other due to the electrostatic force.