‘Friction‘ is a force that resists motion of sliding or rolling of one object moving relative to another. It is a result of the electromagnetic attraction between the charged particles of two touching surfaces. Types of Friction Static Friction : It is defined as the frictional force that acts between the surfaces when they are at rest with respect to each other. The magnitude of the static force is equal in the opposite direction when a small amount of force is applied. When the force increases, at some point maximum static friction is reached. Rolling friction : It is the force that resists motion when an object rolls on a surface. Technically it’s not friction; its ‘rolling resistance’ since when a body rolls perfectly upon a surface, on paper, there is no sliding friction between that object and surface. Sliding friction : It is the frictional force between two surfaces that are rubbing against each other. It’s a very easy and common concept. It’s hard to find a perfectl...
Q1- What is the difference between a conductor and an insulator?
Answer : A conductor allows current to flow easily through it. Insulators don't allow current to flow through it. Electric charges are absent in insulator. Conductors are used in making electrical equipment.
Q2-What is electric current?
Answer : Electric Current is the rate of flow of electrons in a conductor. The SI Unit of electric current is the Ampere. Electrons are minute particles that exist within the molecular structure of a substance. Sometimes, these electrons are tightly held, and other times they are loosely held.
Q3-What is potential difference? Give its unit with definition.
Answer : The amount of work done in moving a unit charge from one point to another is defined as the potential difference between any two points. Potential difference can be written as v = w Q . Here, w is work done and Q is charge. Volt is the SI unit of potential difference (V).
Q4-What are the disadvantages of heating effect of current?
Answer : 1) When an electrical current flows through the conductor, a neighborhood of it's converted into heat. This is often a waste of energy.
2) The warmth produced can damage the insulation and other electrical components, or maybe cause a fireplace.
3) Reduces the lifetime of several components within the circuit.
Q5- What are the advantages of heating effect of current?
Answer : The advantages of the heating effect of current.
1) Current heating is generally utilized in heating systems including electric irons, apartment heaters, as well as heat pumps.
2) They are sometimes used to create light inside electric bulbs as well as lighting equipment.
3) It is suitable for use in appliances such as toasters.
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