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

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 करा
लघु उत्तर
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उत्तर

Figure: Cartridge type fuse/Electric fuse

Uses: 

  1. It is a safety device that protects the wiring from overheating caused by an excessive current supply.
  2. It melts when a high current travels through the circuit, causing the circuit to break and the current to stop flowing through it.
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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 4: Effects of electric current - Exercise [पृष्ठ ६१]

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?


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


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


How does the resistance of a wire vary with its: 

 diameter? 

 


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


Write down the formula for the heat produced when a current I is passed through a resistor R for time t.


An electric iron of resistance 20 ohms draws a current of 5 amperes. Calculate the heat produced in 30 seconds.


A heating coil has a resistance of 200 Ω. At what rate will heat be produced in it when a current of 2.5 A flows through it?


A resistance of 25 Ω is connected to a 12 V battery. Calculate the heat energy in joules generated per minute.


 How much heat will an instrument of 12 W produce in one minute if it is connected to the heat produced by it?  


The heat produced by passing an electric current through a fixed resistor is proportional to the square of:  

(a) magnitude of resistance of the resistor
(b) temperature of the resistor
(c) magnitude of current
(d) time for which current is passed


Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply. Calculate:

  1. the total current taken from the supply
  2. the resistance of each heater and
  3. the energy supplied in kWh to the three heaters in 5 hours.

Give a scientific reason:

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


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.


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.


In an electric bulb, coil of _______ metal is used.


What is the heating effect of electric current?


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


True or False – If False give the correct answer

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


Name some devices that run using heat effect of electric current


Which of the following is correct?


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 cell produces electricity from the ______ ______ in it.


Can we use the same fuse in a geyser and a television set? Explain.


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.


An electric fuse has a body made of ceramic and two points for connecting the fuse wire.


What is an electric fuse made up of?


Explain the working of an electric fuse.


______ wire is used in the filament of the bulbs.


Match the following

1. Bulb a. Conductor
2. Electroplating b.

Insulator

3. Pure water c.  Heating effect of current
4. Salt solution d. Chemical effect of current

Name the effect of the current responsible for the glow of the bulb in an electrical circuit.


What is a trip switch?


An electrochemical cell converts ______ energy into ______ energy.


Find the odd one out.


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

  1. kilowatt hour and
  2. joules.

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.


An electric iron of resistance 20 Ω draws a current of 5 A. The heat developed in the iron in 30 seconds is ______.


An electric iron is rated 220 V, 2 kW. If the iron is used for 3h daily find the cost of running it for one week if it costs ₹ 4.25 per kWh.


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