- Charge on electron (e) = – 1.6 x 10-19 C
- Mass of an electron = 9.11 x 10-31 kg
- Diameter of an electron = 10-15m
- Mass of proton = Mass of neutron=1.67 x 10-27 kg
- Charge on proton = + 1.6 x 10-19 C
- Charge on neutron= Nil
- One coulomb= Charge on 625 x 1016 electrons
- 1 calorie = 4.186 joules
- 1 h.p = 746 watts (h.p= Horse Power)
- 1 Kwh = 36 x 105 Joules
- 1 Kwh = 860 kcal
- Absolute permittivity of vacuum or air (ϵo) = 8.854 x 10-12 F/m
- 1 eV = 1.6 x 10-19 J
- Absolute permeability of vacuum or air (µo) = 4ϖ x 10-11 H/m
- Form factor =1.11
- Peak factor or crest factor = 1.414
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