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महाराष्ट्र राज्य शिक्षण मंडळएस.एस.सी (मराठी सेमी-इंग्रजी) इयत्ता ९ वी

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
जोड्या लावा/जोड्या जुळवा
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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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पाठ 3: Current Electricity - Exercise [पृष्ठ ४४]

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

संबंधित प्रश्‍न

1 A = _________ mA

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

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


What Makes an Electric Current Flow in a Wire?


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


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


A student made an electric circuit shown here to measure the current through two lamps.

Are the lamps in series or parallel?  

(a) Are the lamps in series or parallel?
(b) The student has made a mistake in this circuit. What is the mistake?
(c) Draw a circuit diagram to show the correct way to connect the circuit. Use the proper circuit symbols in your diagram. 


A 5 V battery is connected to two 20 Ω resistors which are joined together in series.

(a) Draw a circuit diagram to represent this. Add an arrow to indicate the direction of conventional current flow in the circuit.
(b) What is the effective resistance of the two resistors?
(c) Calculate the current that flows from the battery?
(d) What is the p.d. across each resistor?


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? 


State three factors on which the heat produced by an electric current depends. How does it depend on these factors? 


Calculate the effective resistance between the points A and B in the network shown below in Figure 8.45   


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.


How many electrons are present in 1 C?

Is kWh the unit of electrical energy?

Define the following:

Electromotive force


Complete the following table. The first answer has been given as an example

Quantity Unit

(a) Electrical potential Volt

( b) Resistance

( c) Power

( d) Energy

( e) Resistivity

Volt

........

..........

............

..............


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?


Electrical appliances have voltage and power ratings as listed below. Which
has the larger working resistance?

Appliances Voltage (V) Power (W)
(a) Washing machine 250 3000
( b) Television 240 160
(c)240 240 1500
( d) Hair curler 250 20
( e) Car head lamp 12 36

State whether the current is a scalar or vector?


MCB is used to protect household electrical appliances.


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


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