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Formula Sheet

DC Circuits and Measurements — Formula Sheet

ICSE · Class 12 · Physics

18 formulas from DC Circuits and Measurements (ICSE Class 12 Physics) on one page, grouped by topic. Includes In parallel.

42 questions38 flashcards18 formulas & key relations5 concepts

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A circuit diagram of a potentiometer setup used to compare the electromotive forces (EMFs) of two cells.
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18 Entries · 6 Sections

Formulas and Key Relations

1. Electric Cell, EMF, Terminal PD, Internal Resistance

E = dW/dq

1 V = 1 J C^-1

V = dW'/dq

E = V + Ir

V = E - Ir

2. Combination of Cells

E_eff = nE ; r_eff = nr ; I = nE/(nr + R)

R1 = r/n ; I = nE/(r + nR)

I = mnE/(nr + mR)

R = nr/m

I_max = nE/2R

3. Kirchhoff's Laws

ΣI = 0

ΣIR = ΣE

4. Wheatstone Bridge and Metre Bridge

P/Q = R/S

S = R[(100 - l)/l]

I = 0 at balance

Current is I = E/(R + r).

Internal resistance can be found by r = R[(E/V) - 1].

In parallel

effective emf remains E and reff = r/n.

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Frequently Asked Questions

What are the important topics in DC Circuits and Measurements for ICSE Class 12 Physics?
Key topics in DC Circuits and Measurements include Electric Cell, EMF, and Terminal Potential Difference, Combination of Cells and Maximum Current, Kirchhoff's Laws, Wheatstone Bridge and Metre Bridge. Study these first, then practise questions on each for the ICSE Class 12 board exam.
How many formulas are in DC Circuits and Measurements?
This sheet lists 18 formulas from DC Circuits and Measurements, grouped by topic. Learn what each symbol stands for so you can apply the formula, not just recall it.
How should I revise DC Circuits and Measurements for the ICSE Class 12 board exam?
Learn the core ideas first, then work through the 42 practice questions on DC Circuits and Measurements. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All ICSE Class 12 Physics Formula Sheet

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