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An Electric Fuse Works on The: (A) Chemical Effect of Current (B) Magnetic Effect of Current (C) Lighting Effect of Current (D) Heating Effect of Current - Science

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प्रश्न

An electric fuse works on the:
(a) chemical effect of current
(b) magnetic effect of current
(c) lighting effect of current
(d) heating effect of current

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उत्तर

(d) heating effect of current
An electric fuse works on the heating effect of current. 

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अध्याय 1: Electricity - Exercise 8

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लखमीर सिंग Physics (Science) [English] Class 10
अध्याय 1 Electricity
Exercise 8 | Q 24

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संबंधित प्रश्न

Compute the heat generated while transferring 96000 coulomb of charge in one hour through a potential difference of 50 V.


An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.


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


Explain why, the current that makes the heater element very hot, only slightly warms the connecting wires leading to the heater.


Derive the expression for the heat produced due to a current 'I' flowing for a time interval 't' through a resistor 'R' having a potential difference 'V' across its ends. With which name is this relation known?


Identify the figure and give its use.


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?


Statement 1 : Electric current ( flow of electrons ) creates heat in the resistor.
Statement 2 : Heat in the resistor is created according to the rule of energy conservation.
Explain Statement 1 with the help of Statement 2.


Give scientific reason :
In the electric equipment producing heat e.g. iron, electric heater, boiler, toaster, etc., an alloy such as Nichrome is used, not pure metals.


Write scientific reason.

A coil made up of alloy Nichrome is used in the electric heater cooker as a resistor.


True or False – If False give the correct answer

The fuse wire does not melts whenever there is overload in the wiring.


B1, B2 and B3 are three identical bulbs connected as shown in Figure. When all the three bulbs glow, a current of 3A is recorded by the ammeter A.

  1.  What happens to the glow of the other two bulbs when the bulb B1 gets fused?
  2. What happens to the reading of A1, A2, A3 and A when the bulb B2 gets fused?
  3. How much power is dissipated in the circuit when all the three bulbs glow together?

 


What are the factors affecting heating effect of electric current?


It would cost a man Rs. 3.50 to buy 1.0 kW h of electrical energy from the Main Electricity Board. His generator has a maximum power of 2.0 kW. The generator produces energy at this maximum power for 3 hours. Calculate how much it would cost to buy the same amount of energy from the Main Electricity Board.


A student boils water in an electric kettle for 20 minutes. Using the same mains supply he wants to reduce the boiling time of water. To do so should he increase or decrease the length of the heating element? Justify your answer.


The electric fuse works on the Joule heating principle.


Define the following:

Electrolyte


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?

Write an expression for the amount of heat produced in a resistor when an electric current is passed through it stating the meanings of the symbols used.


State the law that explains the heating effect of current with respect to the measurable properties in an electrical circuit.


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