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Define the unit of current. - Science

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प्रश्न

Define the unit of current.

व्याख्या
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उत्तर

The unit of electric current is ampere (A). When 1 C of charge flows through a conductor in 1 s, it called 1 ampere (A) current.
I = `Q/t`

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पाठ 4: Electricity - Evaluation [पृष्ठ ५६]

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सामाचीर कलवी Science [English] Class 10 SSLC TN Board
पाठ 4 Electricity
Evaluation | Q VI. 1. | पृष्ठ ५६
एनसीईआरटी Science [English] Class 10
पाठ 12 Electricity
Intext Questions | Q 2 | पृष्ठ २००

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संबंधित प्रश्‍न

Calculate the number of electrons constituting one coulomb of charge.


Which of the following units could be used to measure electric charge?

(a) ampere
(b) joule
(c) volt
(d) coulomb


Which of the following equation shows the correct relationship between electrical unit? 

1A = 1C/s or 1c= 1A/s 


Compare how an ammeter and a voltmeter are connected in a circuit.


What is the conventional direction of the flow of electric current? How does it differ from the direction of flow electrons?


State the factors on which the strength of electric current flowing in a given conductor depends.


What happens to the other bulbs in a series circuit if one bulb blows off?


If you were going to connect two light bulbs to one battery, would you use a series or a parallel arrangement? Why? Which arrangement takes more current from the battery?


 An electrician has wired a house in such a way that if a lamp gets fused in one room of the house, all the lamps in other rooms of the house stop working. What is the defect in the wiring?


In the network shown in the following adjacent Figure, calculate the equivalent resistance between the points.  

  1. A and B
  2. A and C

 


Distinguish between an open and a closed circuit.


Tell the odd one out. Give a proper explanation.


A battery of e.m.f. 15 V and internal resistance 3 ohm is connected to two resistors of resistance 3 ohm and 6 ohm in series. Find:
(i) The current through the battery,
(ii) The p.d. between the terminals of the battery.


What is the purpose of a switch in a circuit? Why is the switch put in the live wire?

A bulb marked 12 V, 24 W operates on a 12 volt car battery for 20 minutes. Calculate:
(i) The current flowing through it, and
(ii) The energy liberated.


Under what circumstances does one get an electric shock from an electrical gadget?

What do you mean by watt-hour?

State two important precautions you should observe while using electricity?

The diagram shows two ways of connecting three lamps P, Q and R to A.C. supply of 220 V.

Name the two arrangements. Which of them would you prefer in a household circuit? Give a reason for your answer.

The circuit diagram in fig  shows two coils of an insulated copper wire wound on a cardboard tube. G is a center zero galvanometer.

(a) Describe what will happen when th e swi tch K is cl osed for severa l
seconds and then opened again .
(b) What will be the effect of repeating the experiment with an iron placed in the tube?


A bulb is connected to a battery of p.d. 4 V and internal resistance 2.5 Ω . A steady current of 0.5 A flows through the circuit. Calculate:

The resistance of the bulb


A geyser is rated 1500 W, 250 V. This geyser is connected to 250 V mains. Calculate:

  1. The current drawn,
  2. The energy consumed in 50 hours, and
  3. The cost of energy consumed at ₹ 4.20 per kWh.

Explain, why the potential difference across the terminals of a cell is more when the cell is not in use than it is when the cell is being used.


State the condition when it is advantageous to connect cells in parallel.


The power of an electric device is a product of ______ and ______.


Conventionally, the direction of the current is taken as:


The flow of electric charge per unit time is called potential difference.


Problems for practice:

If 3A current flows through a circuit, then convert the current in terms of a milliampere.


1020 electrons, each having a charge of 1.6 x 10-19 C, flows in a circuit V is 0.1s. What is the current in ampere?


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