हिंदी

When does overloading occur? - Science and Technology 1

Advertisements
Advertisements

प्रश्न

When does overloading occur?

एक पंक्ति में उत्तर

उत्तर

Overloading occurs, when more appliances work together in a circuit.

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 4: Effects of electric current - Answer the Following

APPEARS IN

एससीईआरटी महाराष्ट्र Science and Technology 1 [English] 10 Standard SSC
अध्याय 4 Effects of electric current
Answer the Following | Q 5

संबंधित प्रश्न

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


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.


Name any two effects of electric current.


Write Joule's law of heating.


An electric kettle rated at 220 V, 2.2 kW, works for 3 hours. Find the energy consumed and the current drawn.


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?


 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. 


The current passing through an electric kettle has been doubled. The heat produced will become:

(a) half
(b) double
(c) four time
(d) one-fourth 


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


Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply. Calculate:

  1. the total current taken from the supply
  2. the resistance of each heater and
  3. the energy supplied in kWh to the three heaters in 5 hours.

Give a scientific reason.

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


Give Scientific reason.

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


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.


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.


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


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


Find the odd one out and give its explanation.


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


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.


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:


The heating element of an electric iron is made up of:


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?

 


Name two electric devices for each where

(i) the heating effect of current is used and

(ii) the 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.


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


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?


The following is not a safety device.


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


Define the following:

Electrolysis and electrolyte


Tara, after completing her exams, went to her grandmother's house along with her younger brother Rahul. One day, Rahul came home after playing and switched on the fan and air conditioner. At the same time, his grandmother was preparing a milkshake for him using a mixer. Suddenly, they heard a big sound and the electricity of the house got shut down. Tara is called an electrician. He said the main reason for supply to shut down was overloading.

  1. What is overloading?
  2. Is overloading and short the same? When does short-circuiting take place?
  3. How can the effects of overloading be avoided?

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?

Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×