मराठी
महाराष्ट्र राज्य शिक्षण मंडळएस.एस.सी (इंग्रजी माध्यम) इयत्ता १० वी

What is overloading?

Advertisements
Advertisements

प्रश्न

What is overloading?

लघु उत्तर
Advertisements

उत्तर

When consumption of electrical power is huge, excessive current is drawn from the transformer supplying the electricity, and if the capacity of the transformer is insufficient, its fuse wire melts and the supply gets shutdown. Such events as called as overloading.

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

संबंधित प्रश्‍न

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


When current is switched ‘on’ in a room heater, it ______.


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?


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?


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


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 × 


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


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


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.

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?


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.


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


Which of the following substance contracts on heating?


What is the heating effect of electric current?


When does overloading occur?


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


Name some devices that run using heat effect of electric current


Explain the heating effect of electric current.


A fuse wire repeatedly gets burnt when used with a good heater. It is advised to use a fuse wire of:


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


Assertion: Bending of wire decreases the resistance of the electric wire.

Reason: The resistance of a conductor depends on length, thickness, nature of material and temperature of the conductor.


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?


How does use of a fuse wire protect electrical appliances?


Name two electric devices for each where

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

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


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


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.


Find the odd one out.


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


Two students decided to investigate the effect of water and air on iron object under identical experimental conditions. They measured the mass of each object before placing it partially immersed in 10 ml of water. After a few days, the object were removed, dried and their masses were measured. The table shows their results.

Student Object Mass of Object
before Rusting in g
Mass of the coated
object in g
A Nail 3.0 3.15
B Thin plate 6.0 6.33

What might be the reason for the varied observations of the two students?


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

  1. kilowatt hour and
  2. joules.

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 ______.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×