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What is the Unit of Electric Current? - Science

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प्रश्न

What is the unit of electric current?

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उत्तर

The SI unit of electric current is ampere and is denoted by the letter, A.

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पाठ 1: Electricity - Exercise 2

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व्हिडिओ ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्‍न

1 A = _________ mA

  1. 102
  2. 103
  3. 10-3
  4. 10-6

In which direction do electrons flow?


How many milliamperes as there in 1 ampere?


If the amount of electric charge passing through a conductor in 10 minutes is 300 C, the current flowing is:

(a) 30 A
(b) 0.3 A
(c) 0.5 A
(d) 5 A


The circuit diagram given below shows the combination of three resistors R1, R2 and R3

  

Find :
(i) total resistance of the circuit.
(ii) total current flowing in the circuit.
(iii) the potential difference across R1.

 

 


If the lamps are both the same in the figure given below and if A1 reads 0.50 A, what do A2, A3, A4 and A5 read? 


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. 

(c) In which circuit, if one bulb blows out, all other will stop glowing?


How do you think the brightness of two lamps arranged in parallel compares with the brightness of two lamps arranged in series (both arrangements having one cell)?


Two lamps, one rated 40 W at 220 V and the other 60 W at 220 V, are connected in parallel to the electric supply at 220 V.  


(a) Draw a circuit diagram to show the connections.
(b) Calculate the current drawn from the electric supply.
(c) Calculate the total energy consumed by the two lamps together when they operate for one hour.


An electric bulb is rated as 10 W, 220 V. How many of these bulbs can be connected in parallel across the two wires of 220 V supply line if the maximum current which can be drawn is 5 A? 


Define the term resistivity. 


Tell the odd one out. Give a proper explanation.


What kind of plot would you except when current (I) is plotted against potential difference (V) for a conductor, at constant temperature?

Complete the following sentence:
A fuse is a short piece of wire of high ......... and low


Two cells each having an e.m.f. of 2 V and an internal resistance of 2Ω are
connected (a) In series, and ( b) In para 1le l as shown in fig. . What is the
current flowing through the cir cu it in each_ case?


Electrical power P is given by the expression P = (Q × V) ÷ time

(a) What do the symbols Q and V represent?

(b) Express the power P in terms of current and resistance explaining the meanings of symbols used there in.


1 kWh = `(1 "volt" xx 1 "ampere" xx "_________")/1000`


At the time of short circuit, the electric current in the circuit ______.


Three resistances, of which two are equal when connected in series have an effective resistance of 30 ohms. When the three resistances are connected in parallel, the effective resistances is 3 ohms. Find the values of the individual resistances.


Electric current passes through a metallic conductor due to the movement of ______.


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