NCERT Solutions for Class 7 Science Chapter 15 Electric Current
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Light is all around us and has many diverse effects. In class 7, students can learn how light affects vision, photosynthesis, plants, and more. Additionally, they can study how light interacts with electromagnetic radiation such as x-rays and gamma rays, as well as explore phenomenon such as refraction in order to gain a better understanding of the effects of light in our everyday lives.
Electric current and its effects is a topic that is taught in Class 7 science. It is an important concept that deals with the flow of electric charge in a circuit. One of the ways to assess the understanding of this concept is by solving worksheets. The Electric current and its effects Class 7 worksheet is a tool that can be used to evaluate the knowledge gained by students on this topic. This worksheet may be available in a PDF format, which can be downloaded from witknowlearn
The flow of electric current can be explained by the movement of electrons in a conductor. The materials that can conduct electricity are called conductors, and those that cannot are called insulators. Fuse wire material is a special kind of wire that is used in electrical circuits to protect them from overload. When there is an overload of current, the fuse wire material melts and breaks the circuit, preventing damage to the other components of the circuit.
Another interesting concept related to electric current is the electric bell. An electric bell works on the principle of an electromagnet. When an electric current passes through a wire wound around an iron core, it produces a magnetic field. This magnetic field attracts a metal rod, which hits the bell and produces a sound.
Spherical mirrors are another important topic that is taught in Class 7 science. There are two types of spherical mirrors, namely concave and convex. A concave mirror is a mirror that curves inward, while a convex mirror curves outward. The two mirrors have different properties, and they can be used for different purposes.
Lenses are also taught in Class 7 science. A lens is a transparent object that is used to refract light. There are two types of lenses, namely convex and concave lenses. A convex lens is thicker at the center than at the edges, while a concave lens is thinner at the center than at the edges.
The effect of electric current is not only limited to the production of magnetic fields but also has other effects such as heating and chemical effects. The effect of electric current is also taught in Class 10 science. In this class, students learn about the different effects of electric current and how it is used in various applications.
The effect of light is another interesting topic that is taught in Class 7 science. Light is a form of energy that travels in straight lines. When light falls on an object, it can be reflected, absorbed or refracted. The effects of light are further explored in this class, and students learn about the different properties of light, such as color, wavelength, and intensity.
The bulb glows only in the presence of an electric current. An electric current is the flow of electric charge in a circuit. Without an electric current, the bulb will not glow. The electric current and its effects Class 7 worksheet is a great tool that can help students to understand this concept better.
In conclusion, electric current and its effects, fuse wire material, electric bell, types of spherical mirror, lens, effects of light, and electric cell are all important concepts that are taught in Class 7 science. These concepts are interconnected and form the basis of understanding the different applications of electricity and light in our daily lives. Worksheets and notes on these topics can be found online and can be used to evaluate the understanding of the students. By mastering these concepts, students can gain a better understanding of the world around them and make informed decisions about their future careers.
Electric current and its effects class 7 important extra questions and answers
Q1: What is electric current? A: Electric current is the flow of electric charge through a conductor.
Q2: What is the unit of electric current? A: The unit of electric current is ampere (A).
Q3: What is the direction of conventional current flow? A: The direction of conventional current flow is from positive to negative.
Q4: What is the difference between AC and DC current? A: AC (alternating current) changes direction periodically, while DC (direct current) flows in only one direction.
Q5: What is resistance? A: Resistance is the opposition to the flow of electric current through a conductor.
Q6: What is the unit of resistance? A: The unit of resistance is ohm (Ω).
Q7: What is Ohm's law? A: Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points.
Q8: What is the formula for calculating resistance? A: Resistance = Voltage/Current
Q9: What is a circuit? A: A circuit is a closed path through which electric current can flow.
Q10: What is a series circuit? A: A series circuit is a circuit in which the components are connected in a single loop, so that the current flows through each component in turn.
Q11: What is a parallel circuit? A: A parallel circuit is a circuit in which the components are connected in multiple loops so that the current can flow through each component independently.
Q12: What is the effect of an electric current on a magnet? A: An electric current produces a magnetic field, so it can make a magnet move or create a magnetic field around a conductor.
Q13: What is an electromagnet? A: An electromagnet is a magnet that is created by passing an electric current through a coil of wire wrapped around a core made of magnetic material.
Q14: What is the importance of electric current in our daily lives? A: Electric current is essential for powering many devices and appliances that we use every day, including lights, computers, televisions, refrigerators, and more. It also plays a crucial role in industries such as transportation, manufacturing, and healthcare.
FAQs
Q1: What is an electric circuit? A: An electric circuit is a path or loop that enables the flow of electric current from one point to another.
Q2: What are conductors? A: Conductors are materials that allow the flow of electric current through them easily.
Q3: What are insulators? A: Insulators are materials that do not allow the flow of electric current through them easily.
Q4: What is the relationship between current, voltage, and resistance? A: The relationship between current, voltage, and resistance is described by Ohm's law, which states that the current through a conductor is directly proportional to the voltage and inversely proportional to the resistance.
Q5: What is the difference between an open circuit and a closed circuit? A: An open circuit is a circuit that is incomplete or broken, and electric current cannot flow through it. A closed circuit, on the other hand, is a circuit that is complete, and electric current can flow through it.
Q6: What is an electric shock? A: An electric shock occurs when a person comes in contact with a source of electric current and the current flows through their body.
Q7: What are the safety precautions to take when working with electric circuits? A: Some safety precautions to take when working with electric circuits include wearing rubber gloves, using insulated tools, avoiding water, turning off power sources before working, and following instructions carefully.
Q8: What are the different types of electric currents? A: The two main types of electric currents are direct current (DC) and alternating current (AC).
Q9: What are the different components of an electric circuit? A: The different components of an electric circuit include a power source, wires or conductors, resistors, switches, and other devices or components.
Q10: What are the different applications of electric current? A: Electric current has many applications, including powering homes and buildings, transportation systems, medical equipment, communication devices, and many other technologies and appliances.