मराठी

An electric cell produces electricity from the ______ ______ in it.

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प्रश्न

An electric cell produces electricity from the ______ ______ in it.

रिकाम्या जागा भरा
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उत्तर

An electric cell produces electricity from the chemicals stored in it.

Explanation:

An electric cell converts chemical energy stored in its chemicals (usually through a chemical reaction between the electrolyte and the electrodes) into electrical energy. This energy is then used to power electrical devices connected to the cell.

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पाठ 14: Electric Current and Its Effects - VERY SHORT ANSWER QUESTIONS [पृष्ठ ७७]

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एनसीईआरटी एक्झांप्लर Science [English] Class 7
पाठ 14 Electric Current and Its Effects
VERY SHORT ANSWER QUESTIONS | Q 8. (ii) | पृष्ठ ७७

संबंधित प्रश्‍न

State four most common electrical appliances based on heating effect of electric current. Why do we use finely heated platinum wire in surgery?


An electric heater is connected to the 230 V mains supply. A current of 8 A flows through the heater. 

(a) How much charge flows around the circuit each second?


Why are the coils of electric irons and electric toasters made of an alloy rather than a pure metal?


Why does the connecting cord of an electric heater not glow hot while the heating element does?


Two exactly similar heating resistances are connected (i) in series, and (ii) in parallel, in two different circuits, one by one. If the same current is passed through both the combinations, is more heat obtained per minute when they are connected in series or when they are connected in parallel? Give reason for your answer.


A coil of an alloy _______ is used in electric heater cooker as a resistor.


Write two devices based on the heating effect of electric current.


Paheli took a wire of length 10 cm. Boojho took a wire of 5 cm of the same material and thickness. Both of them connected the wires as shown in the circuit given in the following figure. The current flowing in both the circuits is the same.

  1. Will the heat produced in both cases be equal? Explain.
  2. Will the heat produced be the same if the wires taken by them are of equal lengths but of different thickness? Explain.


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?

Two students decided to investigate the effect of water and air on iron object under identical experimental conditions. They measured the mass of each object before placing it partially immersed in 10 ml of water. After a few days, the object were removed, dried and their masses were measured. The table shows their results.

Student Object Mass of Object
before Rusting in g
Mass of the coated
object in g
A Nail 3.0 3.15
B Thin plate 6.0 6.33

What might be the reason for the varied observations of the two students?


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