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

State four most common electrical appliances based on heating effect of electric current. Why do we use finely heated platinum wire in surgery?


An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.


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


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


Write Joule's law of heating.


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.


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.


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


Which of the following characteristic is not suitable for a fuse wire?

(a) thin and short
(b) thick and short
(c) low melting point
(d) higher resistance than rest of wiring


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


Identify the figure and give its use.


Identify the figure and give its use.


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


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


The ‘live’ and the ‘neutral’ wires have potential difference of _______.


Find the odd one out and give its explanation.


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


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


Explain the heating effect of electric current.


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


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?


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


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.


What is an electric fuse made up of?


What are the factors affecting heating effect of electric current?


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

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


An electrochemical cell converts ______ energy into ______ energy.


1 kWh is equal to ______.


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


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


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×