मराठी
महाराष्ट्र राज्य शिक्षण मंडळएस.एस.सी (इंग्रजी माध्यम) इयत्ता १० वी

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

Advertisements
Advertisements

प्रश्न

Write scientific reason.

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

स्पष्ट करा
टीपा लिहा
Advertisements

उत्तर

  1. The electric heater-cooker works on the principle of heating effect of electric current.
  2. Alloys (such as nichrome) as compared to metals have higher resistivity.
  3. Unlike metals they can be heated to higher temperature.
    Hence, a coil made up of alloy nichrome is used in the electric heater-cooker as a resistor.
shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 4: Effects of electric current - Write scientific reasons

संबंधित प्रश्‍न

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


An electric iron of resistance 20 Ω takes a current of 5 A. Calculate the heat developed in 30 s.


Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal?


When current is switched ‘on’ in a room heater, it ______.


The safety device based on the heating effect of electric current is called a ______.


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?


Give two reasons why nichrome alloy is used for making the heating elements of electrical appliances.


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?


The current passing through a room heater has been halved. What will happen to the heat produced by it?


What is meant by the heating effect of current? Give two applications of the heating effect of current. 


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


The elements of electrical heating devices are usually made of:

(a) tungsten
(b) bronze
(c) nichrome
(d) argon


Which electric heating device in your home do you think have resistors which control the flow of electricity?


Why does tungsten metal used to make solenoid type coil in an electric bulb?


Name the factors on which the heat produced in a wire depends when current is passed in it, and state how does it depend on the factors stated by you.


Write the mathematical expression for Joule’s law of heating.


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


Name any two appliances which works on the phenomenon of heating effect of electric current.


When does overloading occur?


How can overloading be avoided?


True or False – If False give the correct answer

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


Define fuse.


An electric bulb is connected to a 220 V generator. The current is 0.50 A. What is the power of the bulb?


Which of the following gases are filled in electric bulbs?


An electric component used as a safety device is electric circuit is ______.


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


Copper wire offers very little ______ and does not get heated up quickly.


Name a few appliances which work on the basis of the heating effect of current.


What is a trip switch?


The following is not a safety device.


An electric fuse is a wire made up of a material having ______ melting point.


An electrochemical cell converts ______ energy into ______ energy.


The electric fuse works on the Joule heating principle.


Define the following:

Electrolyte


In the electric equipment producing heat like iron, electric heater, boiler, toaster etc., an alloy such as nichrome is used, not pure metals.


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?


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


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×