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Physics Part-I

Current Electricity

(a) Three resistors 2, 4 and 5 are combined in parallel. What

Physics Part-I

Class 12

NCERT

Chapter 1: Electric Charges and Fields

47 questions

Chapter 2: Electrostatic Potential and Capacitance

46 questions

Chapter 3: Current Electricity

33 questions

(a) Three resistors

1Ω, 2Ω

and

3Ω

are combined in series. What is the total resistance of the combination?

(b) If the combination is connected to a battery of emf 12 V and negligible internal resistance, obtain the potential drop across each resistor.

(a) Three resistors

2Ω, 4Ω

and

5Ω

are combined in parallel. What is the total resistance of the combination?

(b) If the combination is connected to a battery of emf 20 V and negligible internal resistance, detere the current through each resistor, and the total current drawn from the battery.

At room temperature

(27. 0^{o} C)

the resistance of a heating element is

100Ω

. What is the temperature of the element if the resistance is found to be

117Ω

, given that the temperature coefficient of the material of the resistor is

1.70 \times 1 0^{- 4} C^{- 1}

View all question

Chapter 4: Moving Charges and Magnetism

41 questions

Chapter 5: Magnetism and Matter

36 questions

Chapter 6: Electromagnetic Induction

28 questions

Chapter 7: Alternating Current

37 questions

Chapter 8: Electromagnetic Waves

20 questions

Question

Easy

Solving time: 5 mins

(a) Three resistors $2Ω, 4Ω$ and $5Ω$ are combined in parallel. What is the total resistance of the combination?
(b) If the combination is connected to a battery of emf 20 V and negligible internal resistance, detere the current through each resistor, and the total current drawn from the battery.

Name: Video solution 1: [Solved] (a) Three resistors 2Ω,4Ω and 5Ω are combined in parallel. What is the total resistance of the combination?(b) If the combination is connected to a battery of emf 20 V and negligible internal resistance, detere the current through each resistor, and the total current drawn from the battery. - Physics Part-I
Uploaded: 2022-11-16T14:10:46.000Z
Duration: 7 min
Description: Video solution 1: [Solved] (a) Three resistors 2Ω,4Ω and 5Ω are combined in parallel. What is the total resistance of the combination?(b) If the combination is connected to a battery of emf 20 V and negligible internal resistance, detere the current through each resistor, and the total current drawn from the battery. - Physics Part-I

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Updated on: Nov 16, 2022

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Physics Part-I (NCERT)

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Evelyn Discussed

(a) Three resistors

2Ω, 4Ω

and

5Ω

are combined in parallel. What is the total resistance of the combination?

(b) If the combination is connected to a battery of emf 20 V and negligible internal resistance, detere the current through each resistor, and the total current drawn from the battery.

13 mins ago

Discuss this question LIVE

13 mins ago

Text solutionVerified

(a) For Parallel connection,

\frac{1}{R _{p}} = \frac{1}{R _{1}} + \frac{1}{R _{2}} + \frac{1}{R _{3}}

\frac{1}{R _{p}} = \frac{1}{2} + \frac{1}{4} + \frac{1}{5}

\frac{1}{R _{p}} = \frac{10 + 5 + 4}{20}

R_{p} = \frac{20}{19} Ω

(b)

R_{1} = 2Ω, R_{2} = 4Ω, R_{3} = 5Ω

I_{1} = \frac{V}{R _{1}} = 20/2 = 10 A

I_{2} = \frac{V}{R _{2}} = 20/4 = 5 A

I_{3} = \frac{V}{R _{3}} = 20/5 = 4 A

Total current =

I_{1} + I_{2} + I_{3} = 19 A

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Practice more questions from Physics Part-I (NCERT)

(a) Three resistors

1Ω, 2Ω

and

3Ω

are combined in series. What is the total resistance of the combination?

(b) If the combination is connected to a battery of emf 12 V and negligible internal resistance, obtain the potential drop across each resistor.

(a) Three resistors

2Ω, 4Ω

and

5Ω

are combined in parallel. What is the total resistance of the combination?

(b) If the combination is connected to a battery of emf 20 V and negligible internal resistance, detere the current through each resistor, and the total current drawn from the battery.

At room temperature

(27. 0^{o} C)

the resistance of a heating element is

100Ω

. What is the temperature of the element if the resistance is found to be

117Ω

, given that the temperature coefficient of the material of the resistor is

1.70 \times 1 0^{- 4} C^{- 1}

View all

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Question Text	(a) Three resistors $2Ω, 4Ω$ and $5Ω$ are combined in parallel. What is the total resistance of the combination? (b) If the combination is connected to a battery of emf 20 V and negligible internal resistance, detere the current through each resistor, and the total current drawn from the battery.
Updated On	Nov 16, 2022
Topic	Current Electricity
Subject	Physics
Class	Class 12
Answer Type	Text solution:1 Video solution: 1
Upvotes	167
Avg. Video Duration	7 min

(a) Three resistors $2Ω, 4Ω$ and $5Ω$ are combined in parallel. What is the total resistance of the combination?
(b) If the combination is connected to a battery of emf 20 V and negligible internal resistance, detere the current through each resistor, and the total current drawn from the battery.

Text solutionVerified

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(a) Three resistors 2Ω,4Ω and 5Ω are combined in parallel. What is the total resistance of the combination?(b) If the combination is connected to a battery of emf 20 V and negligible internal resistance, detere the current through each resistor, and the total current drawn from the battery.

Text solutionVerified

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