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Why does tungsten metal used to make solenoid type coil in an electric bulb? - Science and Technology 1

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प्रश्न

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

लघु उत्तर
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उत्तर

Tungsten metal is used to make solenoid type coil in an electric bulb because:

  • Tungsten metal has high resistance and high melting point (nearly 3422°C)
  • Because of current it gets heated at high temperature and emits  light.
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2018-2019 (March) Balbharati Model Question Paper Set 2

संबंधित प्रश्‍न

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


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?


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?


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?


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?


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


What is meant by the heating effect of current? Give two applications of the heating effect of current. 


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


An electric fuse works on the:
(a) chemical effect of current
(b) magnetic effect of current
(c) lighting effect of current
(d) heating effect of current


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
(bx × z × y2
(cy × z2 × x
(dy × z × 


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


Give a scientific reason.

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


Give a scientific reason:

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


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?


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).


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.


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.


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


A coil of an alloy _______ is used in electric heater cooker as a resistor.


How can overloading be avoided?


Define fuse.


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


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:


Name two electric devices for each where

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

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


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


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


Fuse is a strip of alloy wire which is made up of lead and tin with a very low ______.


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

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.


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


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


Explain why fuse wire is always connected in a series arrangement.


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?


Anannya responded to the question: Why do electrical appliances with metallic bodies are connected to the mains through a three-pin plug, whereas an electric bulb can be connected with a two-pin plug?

She wrote: Three-pin connections reduce heating of connecting wires.

  1. Is her answer correct or incorrect? Justify.
  2. What is the function of a fuse in a domestic circuit?

When a current I flows through a wire of resistance R for time t then the electrical energy produced is given by ______.


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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