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How can overloading be avoided?

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प्रश्न

How can overloading be avoided?

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उत्तर

Overloading in the electric circuit can be avoided by not connecting many electric appliances at a time in the circuit.

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अध्याय 4: Effects of electric current - Answer the Following

संबंधित प्रश्न

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


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 ______.


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?


Write down the formula for the heat produced when a current I is passed through a resistor R for time t.


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?  


How does the wire in the filament of a light bulb behave differently to the other wires in the circuit when the current flows?

What property of the filament wire accounts for this difference?


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 any six domestic appliances based on the heating effect of electric current.


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


In an electric bulb, coil of _______ metal is 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?


Write two devices based on the heating effect of electric current.


Name some devices that run using heat effect of electric current


Heating effect of current is called ______


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


An electric iron consumes energy at the rate of 420 W when heating is at the maximum rate and 180 W when heating is at the minimum rate. The applied voltage is 220 V. What is the current in each case?


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:


How does use of a fuse wire protect electrical appliances?


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?

 


When a switch is in OFF position,

  1. circuit starting from the positive terminal of the cell stops at the switch.
  2. circuit is open.
  3. no current flows through it.
  4. current flows after some time. 

Choose the combination of correct answer from the following.


Can we use the same fuse in a geyser and a television set? Explain.


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 are the uses of electromagnets?


What is an electric fuse made up of?


______ wire is used in the filament of the bulbs.


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 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.


What is a trip switch?


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


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 consumes 1 kW of electric power when operated at 220 V. A fuse wire of what rating must be used for it?


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

  1. kilowatt hour and
  2. joules.

What is the heating effect of electric current?


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