CET Physics: Electricity – Important Formulas & Short Notes by sarthak patil

 🔋 Key Concepts:


Electric Current (I): Flow of electric charge.

👉 Unit: Ampere (A)


Voltage (V): Electric potential difference.

👉 Unit: Volt (V)


Resistance (R): Opposition to the flow of current.

👉 Unit: Ohm (Ω)


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🔌 Important Formulas:


1. Ohm’s Law:

🔸 V = I × R


2. Power (P):

🔸 P = V × I

🔸 P = I² × R

🔸 P = V² ÷ R


3. Electrical Energy:

🔸 E = P × t (in Joules)

🔸 E = P × t ÷ 1000 (in kWh)

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🧮 Resistor Combinations:


Series:

🔸 R_total = R₁ + R₂ + R₃ + ...


Parallel:

🔸 1/R_total = 1/R₁ + 1/R₂ + ...


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🧠 Tips to Remember:


Series Circuit:

🔹 Current = Same

🔹 Voltage = Divided


Parallel Circuit:

🔹 Voltage = Same

🔹 Current = Divided


Power increases with square of current!

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📌 Posted by: Sarthak Prakash Patil

📖 Sarthak’s Education Corner

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