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

Right or wrong sentence. Live wire and neutral wires have a 220 V potential difference.

Advertisements
Advertisements

प्रश्न

Right or wrong sentence.

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

पर्याय

  • Right

  • Wrong

MCQ
चूक किंवा बरोबर
Advertisements

उत्तर

The given sentence is right.

Explanation:

In standard domestic electrical circuits, the live wire carries the current at a high potential of 220 V, while the neutral wire completes the circuit and is maintained at zero potential (0 V). Because of this, the resulting potential difference or voltage between the two wires is exactly 220 V.

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?

संबंधित प्रश्‍न

Why is the tungsten used almost exclusively for filament of electric lamps?


The safety device based on the heating effect of electric current is called a ______.


Give two reasons why nichrome alloy is used for making the heating elements of electrical appliances.


An electric iron of resistance 20 ohms draws a current of 5 amperes. Calculate the heat produced in 30 seconds.


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 current passing through a room heater has been halved. What will happen to the heat produced by it?


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


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.


Solve the following example.

Two tungsten bulbs of wattage 100 W and 60 W power work on 220 V potential difference. If they are connected in parallel, how much current will flow in the main conductor? 


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.


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.


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


Rewrite the following statement by selecting the correct option:

1 A = ____________ mA.


Answer the following question:
what is the heating effect of the electric current? state any four applications of it?


Write the mathematical expression for Joule’s law of heating.


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


Which of the following substance contracts on heating?


What is the heating effect of electric current?


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


What is a short circuit?


Write scientific reason.

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


Define fuse.


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


Which of the following is correct?


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?

 


What is Joule’s heating effect? How can it be demonstrated experimentally? List its four applications in daily life.


(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.


What are the uses of electromagnets?


What is an electric fuse made up of?


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


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.


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


The graph of voltage vs current for four different materials is shown below.

Which of these four materials would be used for making filament of bulb?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×