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How Many Microamperes Are There in 1 Ampere? - Science

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प्रश्न

How many microamperes are there in 1 ampere?

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उत्तर

1 ampere = 1,000,000 microamperes = `10^6` microamperes  

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अध्याय 1: Electricity - Exercise 2

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लखमीर सिंग Physics (Science) [English] Class 10
अध्याय 1 Electricity
Exercise 2 | Q 8.2

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संबंधित प्रश्न

Which particles constitute the electric current in a metallic conductor?


A current of 4 A flows around a circuit for 10 s. How much charge flows past a point in the circuit in this time?


The p.d. across a 3 Ω resistor is 6 V. The current flowing in the resistor will be:

(a) `1/2A`
(b) 1 A
(c) 2 A
(d) 6 A


In the circuit diagram given below five resistances of 10 Ω, 40 Ω, 30 Ω, 20 Ω, and 60 Ω are connected as shown to a 12 V battery. 

  

Calculate:
(a) total resistance in the circuit. 

(b) total current flowing in the circuit.

 


A battery and three lamps are connected as shown: 

 

Which of the following statements about the currents at X, Y and Z is correct?
(a) The current at Z is greater than that at Y.
(b) The current at Y is greater than that at Z.
(c) The current at X equals the current at Y.
(d) The current at X equals the current at Z. 

 


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

(b) for lighting inside the rooms of the hotel?

 


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?


Name two effects produced by electric current. 

 


The following circuit diagram shows three resistors 2 Ω, 4 Ω and R Ω connected to a battery of e.m.f 2V and internal resistance 3 Ω. If the main current of 0.25 A flows through the circuit, find:

  1. the p.d. across the 4 Ω resistors,
  2. the p.d. across the internal resistance of the cell,
  3. the p.d. across the R Ω or 2 Ω resistors, and
  4. the value of R.


Give two uses of conductors.

Calculate the electric current supplied by a 12 V battery of an automobile to a starter that develops a power of 2.4 kW.

A 200 v electric transfer draws an electric current of 11 A. What is its electrical resistance?

The resistance of 100 W (220 V) bulb is greater than that of 60 W (220 V) bulb. Is it true or false?

The following appliances are to be used on 240 V supply. Calculate the current used by each and say which fuse, 2 amp, 5 amp or 13 amp should be incorporated with each, (i) A television rated at 150 W, (ii) An electric iron rated at 750 W, (iii) An immersion heater rated at 3000 W, (iv) A hair dryer rated at 500 W. How much will it cost to run the television set for 100 days for an average of 4 hours a day at 60 paise per unit?


State expression for Cells connected in series.


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


  1. What is meant by electric current?
  2. Name and define its unit.
  3. Which instrument is used to measure the electric current? How should it be connected in a circuit?

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


The number of electrons constituting a 1-coulomb charge is ______.


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

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