मराठी

Name two electric devices for each where (i) heating effect of current is used and (ii) magnetic effect of current is used. - Science

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प्रश्न

Name two electric devices for each where

(i) the heating effect of current is used and

(ii) the magnetic effect of current is used.

टीपा लिहा

उत्तर

(i) Current-heating devices are used: room heaters and geysers.

(ii) Cranes and electric bells employ the magnetic influence of current.

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पाठ 14: Electric Current and Its Effects - SHORT ANSWER QUESTIONS [पृष्ठ ७८]

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एनसीईआरटी एक्झांप्लर Science [English] Class 7
पाठ 14 Electric Current and Its Effects
SHORT ANSWER QUESTIONS | Q 14. | पृष्ठ ७८

संबंधित प्रश्‍न

Identify the figure and give its use.


Solve the following example.

Heat energy is being produced in a resistance in a circuit at the rate of 100 W. The current of 3 A is flowing in the circuit. What must be the value of the resistance?


What is the heating effect of electric current?


Name some devices that run using heat effect of electric current


Which of the following gases are filled in electric bulbs?


An electric kettle consumes 1 kW of electric power when operated at 220 V. A fuse wire of what rating must be used for it?


Your teacher has shown you the following activity.

Activity: The teacher has wound a long insulated piece of wire around an iron nail in the form of a coil. The free ends of the wire are connected to a cell through a switch as shown in Figure 14.3. The current is switched on and some pins are placed near the ends of the nail.

Write down any three questions that come to your mind about this activity


An electrochemical cell converts ______ energy into ______ energy.


Tara, after completing her exams, went to her grandmother's house along with her younger brother Rahul. One day, Rahul came home after playing and switched on the fan and air conditioner. At the same time, his grandmother was preparing a milkshake for him using a mixer. Suddenly, they heard a big sound and the electricity of the house got shut down. Tara is called an electrician. He said the main reason for supply to shut down was overloading.

  1. What is overloading?
  2. Is overloading and short the same? When does short-circuiting take place?
  3. How can the effects of overloading be avoided?

Anannya responded to the question: Why do electrical appliances with metallic bodies are connected to the mains through a three-pin plug, whereas an electric bulb can be connected with a two-pin plug?

She wrote: Three-pin connections reduce heating of connecting wires.

  1. Is her answer correct or incorrect? Justify.
  2. What is the function of a fuse in a domestic circuit?

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