My students become toppers in their class. I won't scold them and I treat them as my children
As a passionate mathematics teacher, I have always enjoyed imparting knowledge to others. I am a B.Tech graduate in Electronics and Communication....
Ph.D candidate with over 10 years of teaching exp. (7 years at BYJU's and 3 years at DPS Gurgaon). Specialized in IGCSE, ICSE & CBSE curricula.
Do you need help in finding the best teacher matching your requirements?
Post your requirement nowI completed my B.Tech in computer technology and MBA in marketing. I have six years of experience. I began giving home tuition in 2016 in Mumbai and...
Certified in Professionals and Life Skills and All India Institute of Certified Professionals. With 6 years of experience teaching Class 8 students...
I bring over five years of hands-on experience in mathematics and science, making complex topics easy to understand. My deep knowledge in areas like...
This is Debabrato Chatterjee online Maths and Science tutor having 13+years of experience. I have already and presently teaching students of IB,...
I am a school teacher from Kerala , India. I have 15 years teaching experience in CBSE school. I have a degree in statistics. I am a certified trained...
I have done my Masters in Education. I am an experienced, qualified teacher and tutor with over 15 yrs if experience in teaching maths and English,...
My teaching exp.11 year in most reputed coaching in india. Mentor of jee top rank air-12 yatis agrawal, 19, 28 many more in top 100 in jee adavnced....
Sumit attended Class 8 Tuition
"yrstyursyusru"
Student attended Class 8 Tuition
"Very efficient in all the topics , gives the knowledge in depth for the topics"
Sumana attended Class 8 Tuition
"She teaches very well. I can easily relate to chapters and texts. Earlier Mathematics..."
Venkatdilip attended Class 8 Tuition
"Good teacher "
Rahul attended Class 8 Tuition
"chandan sir has deep knowledge of Maths and Science and after that he is friendly..."
Juluri attended Class 8 Tuition
"Narayan sir has a very high spirit and good knowledge of subject. More i like about..."
Subasis attended Class 8 Tuition
"She is good"
Mukut attended Class 8 Tuition
"Nice and friendly teacher. Very cooperative , taking regularly exam. i very much..."
Ask a Question
Post a LessonAnswered on 21/02/2024 Learn CBSE/Class 8/Science/Chemical effects of Electric Current
Sadika
It is dangerous to touch electrical appliances with wet hands due to the increased conductivity of water. When water is present on the skin, it acts as a conductor of electricity. When a person with wet hands touches an electrical appliance, the water on the skin provides a pathway for the electrical current to flow through the body.
Electricity always seeks the path of least resistance, and water present on the skin significantly reduces the body's resistance to electrical current. This can lead to a phenomenon known as electric shock, which occurs when electric current passes through the body. Electric shock can cause a range of injuries, from mild discomfort to severe burns, cardiac arrest, and even death, depending on the severity of the shock and the path the current takes through the body.
Additionally, moisture or water on electrical appliances can increase the risk of short circuits or electrical fires, which can further escalate the danger.
To avoid the risk of electric shock, it's essential to keep hands dry when handling electrical appliances and to ensure that appliances are not used near water sources. Additionally, it's crucial to follow proper electrical safety practices, such as using grounded outlets, avoiding overloading electrical circuits, and keeping electrical appliances away from water.
Answered on 21/02/2024 Learn CBSE/Class 8/Science/Chemical effects of Electric Current
Sadika
Substances that can make any liquid a good conductor of electricity are typically electrolytes. Electrolytes are substances that ionize when dissolved in water or other solvents, producing positively and negatively charged ions that can carry electrical current through the solution. Common examples of substances that can make liquids conductive include:
Ionic Compounds: Ionic compounds, such as salts (e.g., sodium chloride, potassium chloride) and acids (e.g., hydrochloric acid, sulfuric acid), dissociate into ions when dissolved in water, making the solution conductive.
Acids and Bases: Strong acids (e.g., hydrochloric acid) and strong bases (e.g., sodium hydroxide) dissociate completely in water, producing ions and making the solution conductive.
Some Metal Compounds: Some metal compounds, such as metallic salts (e.g., copper sulfate, iron(II) chloride), can also dissociate into ions and make the solution conductive.
Ionized Gases: In some cases, gases can also become conductive when ionized. For example, water can become conductive when exposed to ionizing radiation or when mixed with certain gases like hydrogen chloride.
These substances increase the concentration of ions in the solution, allowing electrical current to flow more easily through the liquid. However, it's important to note that not all liquids are conductive, and the presence of these substances is necessary to make a liquid capable of conducting electricity.
Answered on 21/02/2024 Learn CBSE/Class 8/Science/Chemical effects of Electric Current
Sadika
The part of a bulb that glows is called the filament. The filament is typically made of tungsten wire and is located within the bulb's glass envelope. When an electric current passes through the filament, it heats up due to its resistance, reaching temperatures where it emits visible light. This glowing filament is what produces the light output of an incandescent bulb.
Answered on 21/02/2024 Learn CBSE/Class 8/Science/Chemical effects of Electric Current
Sadika
Distilled water, in its pure form, does not conduct electricity well. This is because it lacks the ions necessary for conducting electric current. Normal water becomes a conductor of electricity due to the presence of minerals and impurities, which dissociate into ions. These ions are the charge carriers that allow electricity to flow through the water.
Distillation removes these impurities and minerals, leaving almost pure water composed of H2O molecules without free ions. Therefore, without ions to carry the charge, distilled water has a very high resistance to electrical current. However, it's important to note that it's very difficult to maintain water in a completely pure state. Even slight contamination with ions can make distilled water conductive to some degree.
Answered on 21/02/2024 Learn CBSE/Class 8/Science/Chemical effects of Electric Current
Sadika
Testing whether liquids conduct electricity can be done using a simple experimental setup. Here's a basic method to determine if a liquid is a conductor or an insulator of electricity:
Set Up the Circuit:
Introduce the Liquid:
Observation:
Pure or distilled water should theoretically not conduct electricity because it lacks ions. However, common tap water, seawater, and many other liquids contain ions that can conduct electricity. The conductivity test can vary significantly based on the concentration of ions in the liquid.
Ask a Question