हिंदी

Match the pairs. ‘A’ Group ‘B’ Group 1. Free electrons a. V/R 2. Current b. Increases the resistance in the circuit 3. Resistivity c. Weakly attached 4. Resistances in series d. VA/LI

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प्रश्न

Match the pairs.

‘A’ Group  ‘B’ Group 
1. Free electrons a. V/R 
2. Current b. Increases the resistance in the circuit 
3. Resistivity c. Weakly attached 
4. Resistances in series d. VA/LI
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उत्तर

‘A’ Group  Answer
1. Free electrons c. Weakly attached
2. Current a. V/R
3. Resistivity d. VA/LI
4. Resistances in series b. Increases the resistance in the circuit
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अध्याय 3: Current Electricity - Exercise [पृष्ठ ४४]

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बालभारती Science and Technology [English] Standard 9 Maharashtra State
अध्याय 3 Current Electricity
Exercise | Q 5. | पृष्ठ ४४

संबंधित प्रश्न

1 A = _________ mA

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

Draw the electrical symbols of the following components and state its use:

Ammeter.


What is an electric current?


In 10 s, a charge of 25 C leaves a battery, and 200 J of energy are delivered to an outside circuit as a result.

  1. What is the p.d. across the battery?
  2. What current flows from the battery?

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.


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.

 

 


Name two effects produced by electric current. 

 


An electric bulb is rated 250 W, 230 V. What information does this convey? Calculate the current through a 60 W lamp rated for 250 V. If the line voltage falls to 200 V, how is the power consumed by the bulb affected?

Name the physical quantity which equals the product of voltage and current.

Define the following:

Semiconductors


A charge of 80 C flows in a conductor for 2 minutes.
(a) Calculate the current flowing through the conductor.
(b) If the current through a heater is 4 A what charge must be passing in 8 seconds?


The circuit diagram (Fig.) shows a battery of e.m.f. 6 volts and internal
resistance of 0.8 Ω oonnected in series. Find the
(a) Current reoorded by the ammeter,
(b) P.d. across the terminals of the resistor B,
( c) Current passing through each of the resistors B, C and D, and
( d) P.d. across the terminals of the battery.


If a fuse contains a 5 A fuse wire and the voltage is 240 V, what is the maximum power (wattage) which may be taken from the circuit?


State whether the following statement is True or False:

The SI unit of charge is the coulomb. 


State expression for Cells connected in series.


Kilowatt hour is the unit of


Name any two devices, which are working on the heating effect of the electric current.


Match the following:

1. 1 mA a. series
2. 1 pA b. ohmmeter
3. Ammeter  c. 10-6 ampere
4. Electrical resistivity d. 10-3 ampere

For current to flow, one needs art open circuit.


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