CBSE Class 10 Science Formulas

The key Science formulas for CBSE Class 10 — electricity, light and chemistry essentials — for quick revision before the 2027 board exam.

For every chapter's formulas, open our CBSE Class 10 Science formula sheets.

Physics Formulas

• Electric current — I = Q/t.
• Ohm's Law — V = IR.
• Resistance — R = ρl/A (ρ is resistivity).
• Resistors in series — R = R₁ + R₂ + R₃.
• Resistors in parallel — 1/R = 1/R₁ + 1/R₂ + 1/R₃.
• Heating effect — H = I²Rt.
• Power — P = VI = I²R = V²/R.
• Mirror formula — 1/v + 1/u = 1/f; magnification m = h'/h = −v/u.
• Lens formula — 1/v − 1/u = 1/f; magnification m = h'/h = v/u.
• Power of a lens — P = 1/f (f in metres; unit dioptre).
• Refractive index — n = c/v = sin i / sin r.

Chemistry Key Equations

• Balancing chemical equations — law of conservation of mass.
• pH scale — acids (pH < 7), bases (pH > 7), neutral (pH = 7).
• Key reactions — neutralisation, decomposition, displacement.

How to Memorise Science Formulas

• Write formulas by hand daily — improves retention.
• Group related formulas — electricity, optics, chemistry.
• Practise numerical problems using each formula.
• Create a one-page formula sheet and revise it every morning.

Based on the CBSE Class 10 Science syllabus 2026-27 (cbseacademic.nic.in). Verify each formula with your NCERT textbook.