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Current Electricity-CBSE Class 12th NCERT Solution

Get, detailed solutions to the questions of the chapter Current Electricity from NCERT textbooks

Jul 29, 2013 17:20 IST
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Get, detailed solutions to the questions of the chapter Current Electricity from NCERT textbooks. The objective is to helping students regarding the pattern of answering the question as per the cbse latest marking scheme.Cbse.jagranjosh.com provided you NCERT solutions for classes 12th math and science subjects .

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Some questions of this chapter are given here

Q. The storage battery of a car has an emf of 12 V. If the internal resistance of the battery is 0.4 Ω, what is the maximum current that can be drawn from the battery?

Sol.

Given:

E = 12 V

r = 0.4 ohm

R = 0 ohm

From Ohm’s law

V = IR

I = E / (R + r)

Or I = 12 / 0.4 = 30 A

Q.  A battery of emf 10 V and internal resistance 3 Ω is connected to a resistor. If the current in the circuit is 0.5 A, what is the resistance of the resistor? What is the terminal voltage of the battery when the circuit is closed

Sol.

Given:

E = 10 V

r = 3 ohms

I = 0.5 A

Unknown resistor = R ohm

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