Important Physics formulas: part 1: We all know the importance of important formulas in physics. It really help us to remember the whole idea of the chapter.

Electron=-1.602 19 × 10-19 C=9.11 × 10-31 kg

Proton=1.602 19 × 10-19 C=1.67 × 10-27 kg

Neutron=0 C=1.67 × 10-27 kg6.022 × 1023 atoms in one atomic mass unite is the elementary charge: 1.602 19 × 10-19 C

Potential Energy, velocity of electron: PE = eV = ½mv21V = 1J/C1N/C = 1V/m1J = 1 N·m = 1 C·V1 amp = 6.21 × 1018

electrons/second = 1 Coulomb/second1 hp = 0.756 kW1 N = 1 T·A·m1 Pa = 1 N/m2Power = Joules/second = I2R = IV [watts W]

Quadratic Equation:xbbaca=−±−242

Kinetic Energy [J]KEmv=122

## Kirchhoff’s Rules

Kirchhoff’s Rules1. The sum of the currents entering a junctions is equal to the sum of the currents leaving the junction.2. The sum of the potential differences across all the elements around a closed loop must be zero.

## MAGNETISM

André-Marie Ampére is credited with the discovery of electromagnetism, the relationship between electric currents and magnetic fields.Heinrich Hertz was the first to generate and detected electromagnetic waves in the laboratory.