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

Give a scientific reason: For electric power transmission, copper or aluminium wire is used. - Science and Technology 1

Advertisements
Advertisements

प्रश्न

Give a scientific reason:

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

कारण सांगा
Advertisements

उत्तर

  1. Copper and aluminium are excellent electrical conductors.
  2. Since the resistance of copper and aluminium is very low, the amount of heat generated while carrying an electric current through them is also low.

Therefore, copper or aluminium wires are used for electricity transfer.

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 4: Effects of electric current - Write scientific reasons

APPEARS IN

बालभारती Science and Technology 1 [English] Standard 10 Maharashtra State Board
पाठ 4 Effects of electric current
Exercises | Q 7.3 | पृष्ठ ६१

संबंधित प्रश्‍न

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


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


How does the resistance of a wire vary with its area of cross-section?


An electric heater is connected to the 230 V mains supply. A current of 8 A flows through the heater. 

(b) How much energy is transferred to the heater each second?


Why is a series arrangement not used for connecting domestic electrical appliances in a circuit?


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


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?


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


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.

 


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


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.


Give Scientific reason.

In practice, the unit kWh is used for the measurement of electrical energy, rather than joule.


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.


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


The electricity bill specifies the usage in _______.


These days when current in the circuit suddenly increases _______ switches are used.


Find the odd one out and give its explanation.


Which metal is used to make the filament of an electric bulb?


What is a short circuit?


What is overloading?


What is used to turn off the sudden increase in current in the electrical circuit of the house nowadays?


Live wire and neutral wires have a 220 V potential difference.


Define fuse.


Heating effect of current is called ______


How does use of a fuse wire protect electrical appliances?


Why is parallel arrangement used in domestic wiring?


Name two electric devices for each where

  1. heating effect of current is used and
  2. magnetic effect of current is used.

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 MCB can be used instead of a fuse in an electrical circuit.


______ wire is used in the filament of the bulbs.


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


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


If 220 V potential difference is applied across an electric bulb, a current of 0.45 A flows in the bulb. What must be the power of the bulb?


In which of the following applications of Iron, rusting will occur most? Support your answer with valid reason.

A B C D

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

  1. kilowatt hour and
  2. joules.

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×