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What does overloading cause? - Science and Technology 1

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प्रश्न

What does overloading cause?

एका वाक्यात उत्तर
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उत्तर

Due to overloading, fuse wire melts and the supply gets shut down.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 4: Effects of electric current - Answer the Following

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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?


Compute the heat generated while transferring 96000 coulomb of charge in one hour through a potential difference of 50 V.


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


An electric room heater draws a current of 2.4 A from the 120 V supply line. What current will this room heater draw when connected to 240 V supply line?


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


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?


The elements of electrical heating devices are usually made of:

(a) tungsten
(b) bronze
(c) nichrome
(d) argon


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 × 


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. 


Rewrite the following statement by selecting the correct option:

1 A = ____________ mA.


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


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


What is overloading?


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


Write scientific reason.

A coil made up of alloy Nichrome is used in the electric heater cooker as a resistor.


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


Explain the application of heating effect of electric current in an electric bulb with a diagram.


Define fuse.


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:


An electric bulb is connected to a 220 V generator. The current is 0.50 A. What is the power of the bulb?


Which of the following gases are filled in electric bulbs?


B1, B2 and B3 are three identical bulbs connected as shown in Figure. When all the three bulbs glow, a current of 3A is recorded by the ammeter A.

  1.  What happens to the glow of the other two bulbs when the bulb B1 gets fused?
  2. What happens to the reading of A1, A2, A3 and A when the bulb B2 gets fused?
  3. How much power is dissipated in the circuit when all the three bulbs glow together?

 


(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).


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.


What are the factors affecting heating effect of electric current?


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


A student boils water in an electric kettle for 20 minutes. Using the same mains supply he wants to reduce the boiling time of water. To do so should he increase or decrease the length of the heating element? Justify your answer.


The following is not a safety device.


A trip switch is a ______ safety device.


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


Find the odd one out.


State the law that explains the heating effect of current with respect to the measurable properties in an electrical 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 of resistance 20 Ω draws a current of 5 A. The heat developed in the iron in 30 seconds is ______.


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