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Chemical effects of Electric Current

Chemical effects of Electric Current relates to CBSE/Class 8/Science

Top Tutors who teach Chemical effects of Electric Current

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Chemical effects of Electric Current Questions

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Answered 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... read more

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.

 
 

 
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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... read more

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:

  1. 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.

  2. 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.

  3. 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.

  4. 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.

 
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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... read more

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.

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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... read more

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.

 
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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: Materials Needed: A battery or a low-voltage power source Two wires Two electrodes (these can be made from metals... read more

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:

Materials Needed:

  • A battery or a low-voltage power source
  • Two wires
  • Two electrodes (these can be made from metals like copper or zinc, often in the form of strips or rods)
  • A bulb or an LED (Light Emitting Diode) as an indicator, or a multimeter
  • The liquid to be tested

Steps:

  1. Set Up the Circuit:

    • Connect one wire from the positive terminal of the battery or power source to one of the electrodes.
    • Connect the second electrode to the bulb or LED. Then, complete the circuit by connecting the other terminal of the bulb or LED back to the negative terminal of the battery or power source. If using a multimeter, it should be set to measure electrical conductivity or resistance, with one probe connected to each electrode.
  2. Introduce the Liquid:

    • Place the electrodes into the liquid to be tested, ensuring that they are not touching each other to avoid a short circuit.
  3. Observation:

    • If the bulb lights up or the LED glows, it indicates that the liquid is conducting electricity, allowing the current to flow through the circuit. If using a multimeter, a drop in resistance or an indication of conductivity confirms that the liquid is a conductor.
    • If the bulb does not light up, the LED remains off, or the multimeter shows high resistance (or no change indicating no conductivity), it suggests that the liquid does not conduct electricity, classifying it as an insulator.

Safety Precautions:

  • Always use a low-voltage power source to avoid the risk of electric shock.
  • Do not test unknown liquids that could be hazardous.
  • Wear appropriate protective equipment, such as gloves and goggles, if necessary.

Note:

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.

 
 
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