Electricity Cheat Sheet

Key Definitions

• Electric Current: Flow of electric charge, measured in Amperes (A) ✅

• Voltage (Potential Difference): Work done per unit charge, measured in Volts (V) ✅

• Resistance: Opposition to current flow, measured in Ohms (Ω) ✅

• Ohm's Law: Relationship between voltage, current, and resistance ✅

Important Concepts

Electric Circuits

• Series Circuit: Components connected in a single path; total resistance = sum of individual resistances ✅

• Parallel Circuit: Components connected across the same voltage source; total resistance is less than the smallest resistance ✅

Power in Electrical Circuits

• Power (P) is the rate of doing work or consuming energy in a circuit. ✅

• Power Formula: P = VI where P = power (W), V = voltage (V), I = current (A) ✅

Key Formulas

• I: Current (A) ✅

• V: Voltage (V) ✅

• R: Resistance (Ω) ✅

P = VI

• P: Power (W) ✅

R_total (series) = R1 + R2 + ... + Rn ✅
1/R_total (parallel) = 1/R1 + 1/R2 + ... + 1/Rn ✅

Common Mistakes to Avoid

Common Mistake: Confusing series and parallel circuit properties, especially in calculating total resistance.

Memory Tricks

Tip: "Ohm's Law" - Remember VIR:

• V = Voltage

• I = Current

• R = Resistance

Key Diagrams

Series Circuit:
  +---[R1]---[R2]---[R3]---+
  |                        |
  +------------------------+
Parallel Circuit:
  +---[R1]---+
  |          |
  +---[R2]---+
  |          |
  +---[R3]---+