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Define the unit of current. - Science

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प्रश्न

Define the unit of current.

परिभाषा

उत्तर १

The unit of electric current is ampere (A). 1 A is defined as the flow of 1 C of charge through a wire in 1 s.

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उत्तर २

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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उत्तर ३

The SI unit of the electric current is ampere (A). The current flowing through a conductor is said to be one ampere when a charge of one coulomb flows across any cross-section of a conductor in one second. Hence,
1 ampere = \(\frac{1 \text { coulomb }}{1 \text { second }}\).

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अध्याय 4: Electricity - Evaluation [पृष्ठ ५६]

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

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संबंधित प्रश्न

What actually travels through the wires when you switch on a light?


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

1A = 1C/s or 1c= 1A/s 


What Makes an Electric Current Flow in a Wire?


<p> Define the unit of electric current (or Define ampere).


What is an Ammeter? How is It Connected in a Circuit? Draw a Diagram to Illustrate Your Answer.


Why should the resistance of: 

 an ammeter be very small?


Why should the resistance of: 

a voltmeter be very large?


If the charge on an electron is 1.6 × 1019 coulombs, how many electrons should pass through a conductor in 1 second to constitute 1 ampere current?


One coulomb of charge flows through any cross-section of a conductor in 1 second. What is the current flowing through the conductor?


If the current through a floodlamp is 5 A, what charge passed in 10 seconds?

(a) 0.5 C
(b) 2 C
(c) 5 C
(d) 50 C


A car headlight bulb working on a 12 V car battery draws a current of 0.5 A. The resistance of the light bulb is:

(a) 0.5 Ω
(b) 6 Ω
(c) 12 Ω
(d) 24 Ω


You can given one hundred 1 Ω resistors. What is the smallest and largest resistance you can make in a circuit using these?


Which type of circuit, series or parallel, is preferred while connecting a large number of bulbs: 

(a) for decorating a hotel building from outside?


Ten bulbs are connected in a series circuit to a power supply line. Ten identical bulbs are connected in a parallel circuit to an identical power supply line. 

(b) In which circuit, if one bulbs be brighter?


Consider the circuit given below when A, B and C are three identical light bulbs of constant resistance.   

(a) List the bulbs in order of increasing brightness.
(b) If C burns out, what will be the brightness of A now compared with before?
(c) If B burns out instead, what will be the brightness of A and C compared with before?


An electric bulb is rated at 220 V, 100 W. What is its resistance? What maximum current can be passed through it?

Two resistors of 4 Ω and 6 Ω are connected in parallel. The combination is
connected across a 6 volt battery of negligible resistance. Calculate:
( i) The power supplied by the battery,
(ii) The power dissipated in each resistor.


The marking on an electric bulb reads; 200 V, 60 W. What does it mean?

What type of electricity is supplied to us at houses?

Define the following:

 Electromotive force


What are the factors on which the resistance of a conductor depends? Distinguish between conductors and insulators.

Find the effective resistance in the following circuit diagrams (Fig.):


What is the criteria for selecting a fuse wire?


What would be the danger involved in replacing a blown fuse with the one which would carry a large current?


An electric oven is rated as 1.5 kW, 250 V. If it is connected to a 250 V mains, calculate the
(a) Current drawn,
(b) Energy consumed in 20 hours,
(c) Cost of energy consumed in 20 hours at the rate of Re. 1 per unit.


An electric iron is rated 750 W, 230 V. Calculate the electrical energy consumed by the press in 16 hours.


Match the items in column-I to the items in column-II:

Column - I Column - II
(i) electric current (a) volt
(ii) potential difference (b) ohm meter
(iii) specific resistance (c) watt
(iv) electrical power (d) joule
(v) electrical energy (e) ampere

Assertion (A): Electric current will not flow between two charged bodies when connected if their charges are the same.
Reason (R): Current is the rate of flow of charge.


Find the odd one out.


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