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Identify the figure and give its use.

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प्रश्न

Identify the figure and give its use.

Identify a figure and write one use of it:

वर्गीकरण करो
लघु उत्तरीय
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उत्तर

  • Figure: MCB (Miniature Circuit Breaker)
  • Uses: An MCB is a device which functions as a fuse but does not require replacement. MCB falls down to break the circuit when a heavy amount of current flows through it. Once the fault is rectified, the MCB is reset.
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अध्याय 4: Effects of electric current - Exercise [पृष्ठ ६१]

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बालभारती Science and Technology Part 1 [English] Standard 10 Maharashtra State Board
अध्याय 4 Effects of electric current
Exercise | Q 11. b. | पृष्ठ ६१

संबंधित प्रश्न

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


Why is the tungsten used almost exclusively for filament of electric lamps?


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


An electric room heater draws a current of 2.4 A from the 120 V supply line. What current will this room heater draw when connected to 240 V supply line?


An electric kettle rated at 220 V, 2.2 kW, works for 3 hours. Find the energy consumed and the current drawn.


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?


Name the material which is used for making the filaments of an electric bulb.


The heat produced in a wire of resistance 'x' when a current 'y' flows through it in time 'z' is given by:

(a) x2 × y × z
(b) x × z × y2
(c) y × z2 × x
(d) y × z × x 


If the current flowing through a fixed resistor is halved, the heat produced in it will become:


The electrical resistivities of four materials P, Q, R and S are given below:

P `6.84xx10^8`Ωm
Q `1.70xx10^8`Ωm  
R ` 1.0xx10^15`Ωm
s  `11.0xx10^-7`Ωm  

Which material will you use for making: (a) heating element of electric iron (b) connecting wires of electric iron (c) covering of connecting wires? Give reason for your choice in each case.

 


How does the wire in the filament of a light bulb behave differently to the other wires in the circuit when the current flows?

What property of the filament wire accounts for this difference?


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


Give a scientific reason:

For electric power transmission, copper or aluminium wire is used.


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?


An electric iron of 1100 W is operated for 2 hrs daily. What will be the electrical consumption expenses for that in the month of April? (The electric company charges Rs 5 per unit of energy).


Name any six domestic appliances based on the heating effect of electric current.


The electricity bill specifies the usage in _______.


Which of the following substance contracts on heating?


Find the odd one out and give its explanation.


What is the heating effect of electric current?


What is overloading?


What does overloading cause?


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.


Heating effect of current is called ______


A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross-section of the filament in 16 seconds would be roughly:


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?


How does use of a fuse wire protect electrical appliances?


What is Joule’s heating effect? How can it be demonstrated experimentally? List its four applications in daily life.


Unscramble the following words:

SFEU


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


Assertion: A current-carrying wire should be charged.
Reason: The current in a wire is due to the flow of free electrons in a definite direction.


A fuse is used in an electric circuit to stop high currents flowing through the circuit.


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?


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?


An electric kettle of 2 kW is used for 2h. Calculate the energy consumed in 

  1. kilowatt hour and
  2. joules.

What is the heating effect of electric current?


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