हिंदी

The Current Passing Through a Room Heater Has Been Halved. What Will Happen to the Heat Produced by It? - Science

Advertisements
Advertisements

प्रश्न

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

Advertisements

उत्तर

The heat produced by the room heater will become one-fourth the previous quantity when the current passing through it is halved because the heat produced is directly proportional to the square of the current.

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 1: Electricity - Exercise 8

APPEARS IN

लखमीर सिंग Physics (Science) [English] Class 10
अध्याय 1 Electricity
Exercise 8 | Q 21.3

वीडियो ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्न

How does the resistance of a wire vary with its: 

 diameter? 

 


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?


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


An electric iron is connected to the mains power supply of 220 V. When the electric iron is adjusted at 'minimum heating' it consumes a power of 360 W but at 'maximum heating' it takes a power of 840 W. Calculate the current and resistance in each case. 


Give a scientific reason.

Tungsten metal is used to make a solenoid type coil in an electric bulb.


Rewrite the following statement by selecting the correct option:

1 A = ____________ mA.


Which of the following substance contracts on heating?


What is the heating effect of electric current?


When does overloading occur?


True or False – If False give the correct answer

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


Name any two appliances which work under the principle of heating effect of current.


Which of the following is correct?


An electric iron draws a current of 4 A when connected to 220 V mains. Its resistance must be:


(a) Observe the diagram given below and state whether the bulb will glow or not when we switch on K.

(b) Is it safe to handle the bulb when the switch is OFF?

(c) Give a reason for your answer in (b).


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.


______ wire is used in the filament of the bulbs.


An electrochemical cell converts ______ energy into ______ energy.


Define the following:

Electrolyte


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.


The graph of voltage vs current for four different materials is shown below.

Which of these four materials would be used for making filament of bulb?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×