CBSE, ICSE Physics – Image Formation in Curved Mirrors
In this topic, we study how images are formed by concave and convex mirrors, by using ray diagrams. From the earlier topic on Reflections, we know that there are two…
CBSE, ICSE Physics – Reflection
Quick summary of Reflection topic covered in CBSE and ICSE curriculum, across all the grades, in a simple manner. Reflection is the change in the direction of a wave when…
Electric Motor – An Overview of AC Motors
A quick recap: Electricity is supplied in two forms, direct current (DC) and alternating current (AC). Some devices operate on DC, while others operate on AC. We have already had…
Electromagnetic Induction, The Basis of Generators and Transformer
We have seen how a current carrying conductor experiences a force when placed in a magnetic field. What happens if force is applied on a conductor inside a magnetic field?…
Sources of Electricity: From Fossil Fuels to Renewables
Electricity is a form of energy found in the charges of atoms. To harness this energy, we use devices that convert it into a useful form by making the charges…
Electricity – Its Classification
Electricity has existed since the beginning of the universe, as it originates from atoms and their charged particles. However, humans began harnessing this powerful form of energy only about 200…
Alternating Current, An Introduction
Here are a few terms that are frequently used when we talk about AC, that is, Alternating Current. Some of them are used when talking about Direct Current as well.…
Heat and Temperature, Are They Same?
Heat and Temperature are the words we use regularly, and we keep interchanging the meanings. Yes, they are different, but how? Why do we feel hot touching a cooker on…
Artificial Magnets
We have made an introduction to magnets earlier. We read about natural magnets, and the earth's magnetic field. Now let us read about artificial magnets. What is an artificial magnet?…
Magnets, An Introduction
We all have played with magnets at some point in our childhood. Magnets have applications in many devices we use that we hardly notice them. A small introduction to magnets…
Gravitation, Escape Velocity, and More
Why do things fall down? Why must we apply effort to make things go up? Do all things fall down at the same rate? Why do we not use an…
Electric Motor – An Overview of DC Motors
Have you seen a motor? Surely, we all have seen and used motors, from the mobile phone in our pocket to huge industries. We use motors at home and in…
Passive Elements in Electrical Circuits
Resistor, Inductor, Capacitor - These are the three passive elements in an electrical circuit. An electric circuit consists of active elements and passive elements. An active element supplies energy to the…
Factors Affecting Resistance
Resistance to electric current is present in all materials. The amount of resistance depends on certain physical factors. What are they? We will see now. Resistance refers to the opposition…
Power and Energy
In electrical engineering, the terms power and energy are commonly used. While laypeople often use them interchangeably, they are not the same. So, what’s the difference? Let’s find out. We…
Moment of Force (Torque)
We observe motion all around us. Some motions are linear, meaning they occur along a straight line, while others are rotational. Let’s explore the force behind rotational motion and what…
Exercises – Moment of Force
1. A door is 3 feet wide. Calculate the moment of force when a force of 100 N is applied ata. the end of the door b. the middle of…
Ohm’s Law
We know what is current and voltage. Is there any relation between these two? Yes. It is given by a law that is as basic as the alphabet is to…
Current Electricity
We use terms such as current, voltage, as part of our daily routine. What are they? Let us see their meanings and relationship with each other. We have seen what…
Static Electricity
We know that electricity is electrons in motion. Then what is static electricity? How is it electricity when it is static? Let us see now. As we have seen earlier,…