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What is the use of earthing wire? - Science and Technology 1

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प्रश्न

What is the use of earthing wire?

टिप्पणी लिखिए

उत्तर

  1. Earthing wire is used to protect one from an electric shock.
  2. It does this by providing a path for a fault current to flow to the earth.
  3. It also causes the protective device (fuse) to switch off the electric current to the circuit that has the fault.
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अध्याय 4: Effects of electric current - Answer the Following

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एससीईआरटी महाराष्ट्र Science and Technology 1 [English] 10 Standard SSC
अध्याय 4 Effects of electric current
Answer the Following | Q 8

संबंधित प्रश्न

Redraw the circuit of question 1, putting in an ammeter to measure the current through the resistors and a voltmeter to measure the potential difference across the 12 Ω resistors. What would be the readings in the ammeter and the voltmeter?


What do the following symbols mean in circuit diagrams?  


Draw circuit symbols for variable resistance


Explain with the help of a labelled circuit diagram how you will find the resistance of a combination of three resistors, or resistance R1, R2 and R3, joined in parallel. Also mention how you will connect the ammeter and the voltmeter in the circuit when measuring the current in the circuit and the potential difference across one of the three resistors of the combination.


How does the short circuit form? What is its effect?


The following figure shows the symbols for components used in the accompanying electrical circuit. Place them at proper places and complete the circuit.

Which law can you prove with the help of above circuit?


In an electric circuit, electron flow a from of point of ______ potential to the point of ______ potential.


What do you understand by an electric circuit?

Write the condition required for a circuit to be a closed circuit. 


Match the column ‘A’ with column ‘B’.

Column ‘A’
Column ‘B’
(1) Eka - boron
(a) Germanium
(2) Eka - Aluminium
(b) Scandium
(3) Eka - Silicon
(c) Gallium

Answer the following question.
With the help of a suitable circuit diagram prove that the reciprocal of the equivalent resistance of a group of resistances joined in parallel is equal to the sum of the reciprocals of the individual resistances. 


How is a voltmeter connected in a circuit?

What is open circuit?


In any electric circuit, when the switch is on and the current flows through it why do the wire, switches, bulb or devices become hot?


Write scientific reason.

It is beneficial to carry electrical energy in AC form as it is carried over long distances.


______ is the device used to close or open an electric circuit.


Tabulate the different components of an electric circuit and their respective symbols.


In which of the following circuits are the bulb connected in series?


Higher Order Question

A student made a circuit by using an electric cell, a switch, a torch bulb (fitted in the bulb holder), and copper connecting wires. When he turned on the switch, the torch bulb did not glow at all. The student checked the circuit and found that all the wire connections were tight.

  • What could be the possible reason for the torch bulb not glowing even when the circuit appears to be complete?

Study the electric circuit below. Which of the following switches should be closed so that only two bulbs will light up


_____ has a thin metallic filament that melts and breaks the connection when the circuit is overheated.


Assertion: People struck by lightning receive a severe electrical shock.

Reason: Lightning carries very high voltage.


What is electric circuit?


State whether true or false. If false, correct the statement.

Ammeter is connected in parallel in any electric circuit.


In a simple circuit, why does the bulb glow when you close the switch?


When a circuit is open, _____ cannot pass through it.


Instead of metal wires, a jute string can be used to make a circuit.


Assertion: In an open circuit, the current passes from one terminal of the electric cell to another.

Reason: Generally, the metal disc of a cell acts as a positive terminal.


The rate of flow of electric charges in a circuit is called ______.


In the following circuits (Figure), heat produced in the resistor or combination of resistors connected to a 12 V battery will be

(i) (ii) (iii) 

Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of 2Ω in series with a combination of two resistors (4Ω each) in parallel and a voltmeter across the parallel combination. Will the potential difference across the 2Ω resistor be the same as that across the parallel combination of 4Ω resistors? Give reason.


In the above circuit, if the current reading in the ammeter A is 2A, what would be the value of R1


The ______ is a species of fish that can give electric shocks of up to six hundred fifty watts of electricity.


Boojho has a cell and a single piece of connecting wire. Without cutting the wire in two, will he be able to make the bulb glow? Explain with the help of a circuit diagram.


Overloading of electric circuits can lead to short-circuiting.


Set up the circuit shown in Figure again. Move the key to ‘ON’ position and watch carefully in which direction the compass needle gets deflected. Switch ‘OFF’ the current. Now keeping rest of the circuit intact, reverse the connections at the terminal of the cell. Again switch ‘on’ the current. Note the direction in which the needle gets deflected. Think of an explanation.


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