Conductors and insulators Look at Figures (a)-(d). Each shows a complete electric circuit. Then why is it that the bulb glows only in circuits (b) and (d)? It is because not all materials allow electric current to pass through them. A material that allow…

What is nucleus of an atom?The Composition of the Nucleus:A physicist looks at a stone table and says that it is mostly empty space inside. How is this statement true? Matter is made up of very small particles called atoms.Atoms are composed of three fun…

What is the use of transistor in electronics?Transistors:A transistor is an electronic device which has three terminals labelled as base, collector and emitter.It is a solid state electronic device that has many functions such as being a switch, amplifi…

What is the electrical energy?Electrical energy is important because this form of energy can be easily converted into other forms of energy such as heat, light, mechanical and electromagnetic energy.Electrical energy can be defined as the energy carried …

Magnetic Field Due to a Current Carrying Straight ConductorThe Magnetic Field Due to a Current in a Straight Wire:The magnetic field lines are concentric circles as shown in Figure. The spacing between the circles increases as you move away from the wire…

What is the Radioactive Isotope?Figure (a) shows two fresh onions. After being left aside for 2 weeks, P remains the same but Q has sprouted, as shown in Figure (b).Onion P had been irradiated with gamma radiation. The gamma rays passing through the onio…

What is magnetic force on a current carrying conductor?The Force on a Current Carrying Conductor in a Magnetic FieldFigure shows the power window of a car. The glass sheet can slide up or down when the switch is pulled. The movement of the glass sheet is…

What is the electromotive force of a cell?A light bulb will light up when it is connected in series with a cell as shown in Figure. The cell is the source of energy and the bulb is the energy-consuming device.The light bulb converts electrical energy int…

How series and parallel circuits are different?Series and Parallel CircuitsElectrical circuit can be connected in two basic ways, in series or in parallel. In a series circuit, all the components are connected one after the other in one single path.Figur…

Realising the Importance of Proper Management of Radioactive SubstancesRealising the Importance of Proper Management of Radioactive Substances:Radiation may be defined as energy travelling through space. It can be classified as: (a) Non-ionising radiatio…