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Do the same exercise as above with the replacement of the earl
Physics Part-I
Physics Part-I

Class 12

NCERT

Publisher:
NCERT
Subject:
Physics
1

Chapter 1: Electric Charges and Fields

47 questions

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2

Chapter 2: Electrostatic Potential and Capacitance

46 questions

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3

Chapter 3: Current Electricity

33 questions

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4

Chapter 4: Moving Charges and Magnetism

41 questions

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5

Chapter 5: Magnetism and Matter

36 questions

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6

Chapter 6: Electromagnetic Induction

28 questions

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7

Chapter 7: Alternating Current

37 questions

Q1
A small town with a demand of 800 kW of electric power at 220 V is situated 15 km away from an electric plant generating power at 440 V.The resistance of the two wire line carrying power is 0.5 per km.The town gets power from the line through a 4000-220 V step-down transformer at a sub-station in the town.

(a) Estimate the line power loss in the form of heat.

(b) How much power must the plant supply, assug there is negligible power loss due to leakage?

(c) Characterise the step up transformer at the plant.

Q2
Do the same exercise as above with the replacement of the earlier transformer by a 40,000-220 V step-down transformer (Neglect, as before, leakage losses though this may not be a good assumption any longer because of the very high voltage transmission involved).Hence, explain why high voltage transmission is preferred?

Exercise:
[
A small town with a demand of 800 kW of electric power at 220 V is situated 15 km away from an electric plant generating power at 440 V.The resistance of the two wire line carrying power is 0.5 per km.The town gets power from the line through a 4000-220 V step-down transformer at a sub-station in the town.
]
Q3
A light bulb is rated at for a supply. Find (a) the resistance of the bulb; (b) the peak voltage of the source; and (c) the rms current through the bulb.
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8

Chapter 8: Electromagnetic Waves

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Question
Medium
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Solving time: 3 mins

Do the same exercise as above with the replacement of the earlier transformer by a 40,000-220 V step-down transformer (Neglect, as before, leakage losses though this may not be a good assumption any longer because of the very high voltage transmission involved).Hence, explain why high voltage transmission is preferred?

Exercise:
[
A small town with a demand of 800 kW of electric power at 220 V is situated 15 km away from an electric plant generating power at 440 V.The resistance of the two wire line carrying power is 0.5 per km.The town gets power from the line through a 4000-220 V step-down transformer at a sub-station in the town.
]

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Book:

Physics Part-I (NCERT)

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Do the same exercise as above with the replacement of the earlier transformer by a 40,000-220 V step-down transformer (Neglect, as before, leakage losses though this may not be a good assumption any longer because of the very high voltage transmission involved).Hence, explain why high voltage transmission is preferred?

Exercise:
[
A small town with a demand of 800 kW of electric power at 220 V is situated 15 km away from an electric plant generating power at 440 V.The resistance of the two wire line carrying power is 0.5 per km.The town gets power from the line through a 4000-220 V step-down transformer at a sub-station in the town.
]
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Text SolutionText solutionverified iconVerified

Current is
(a) line power loss =
(b) Power supply by the plant =
(c) Voltage drop on the line is
It is clear that th epercentage power loss is greatly reduced by high voltage transmission. The power loss is .
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Practice more questions from Physics Part-I (NCERT)

Q1
A small town with a demand of 800 kW of electric power at 220 V is situated 15 km away from an electric plant generating power at 440 V.The resistance of the two wire line carrying power is 0.5 per km.The town gets power from the line through a 4000-220 V step-down transformer at a sub-station in the town.

(a) Estimate the line power loss in the form of heat.

(b) How much power must the plant supply, assug there is negligible power loss due to leakage?

(c) Characterise the step up transformer at the plant.

Q2
Do the same exercise as above with the replacement of the earlier transformer by a 40,000-220 V step-down transformer (Neglect, as before, leakage losses though this may not be a good assumption any longer because of the very high voltage transmission involved).Hence, explain why high voltage transmission is preferred?

Exercise:
[
A small town with a demand of 800 kW of electric power at 220 V is situated 15 km away from an electric plant generating power at 440 V.The resistance of the two wire line carrying power is 0.5 per km.The town gets power from the line through a 4000-220 V step-down transformer at a sub-station in the town.
]
Q3
A light bulb is rated at for a supply. Find (a) the resistance of the bulb; (b) the peak voltage of the source; and (c) the rms current through the bulb.
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Practice questions from Physics Part-I (NCERT)

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At an airport, a person is made to walk through the doorway of a metal detector, for security reasons. If she/he is carrying anything made of metal, the metal detector emits a sound. On what principle does this detector work?
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Topic:

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Book:

Physics Part-I (NCERT)

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Question 2
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An LC circuit contains a 20 mH inductor and a 50 F capacitor with an initial charge of 10 mC. The resistance of the circuit is negligible. Let the instant the circuit is closed be t = 0.(a) What is the total energy stored initially? Is it conserved during LC oscillations?

(b) What is the natural frequency of the
circuit?

(c) At what time is  the energy stored 

     (i) completely electrical (i.e., stored in the capacitor)? 

     (ii) completely magnetic (i.e. stored in the inductor)?

(d) At what times is the total energy shared
equally between the inductor and the capacitor?

(e) If a resistor is inserted in the circuit,

how much energy is eventually dissipated as heat?

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Alternating Current

Book

Book:

Physics Part-I (NCERT)

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Question 3
Medium
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A coil of inductance 0.50 H and resistance is connected to a 240 V, 50 Hz ac supply.
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Physics Part-I (NCERT)

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Question Text
Do the same exercise as above with the replacement of the earlier transformer by a 40,000-220 V step-down transformer (Neglect, as before, leakage losses though this may not be a good assumption any longer because of the very high voltage transmission involved).Hence, explain why high voltage transmission is preferred?

Exercise:
[
A small town with a demand of 800 kW of electric power at 220 V is situated 15 km away from an electric plant generating power at 440 V.The resistance of the two wire line carrying power is 0.5 per km.The town gets power from the line through a 4000-220 V step-down transformer at a sub-station in the town.
]
TopicAlternating Current
SubjectPhysics
ClassClass 12
Answer TypeText solution:1
Upvotes78