This may include a random charged plate close to the ground, a pair of parallel conducting wires, etc. All of the above have capacitance. But all electronics books, clearly define a capacitor as a passive two-terminal electrical component used to store electrical energy temporarily in an electric field. Also, it is quite useful to think of a capacitor as storing charge, in order to understand its behavior.
The first immunizations for tetanus, diphtheria and pertussis (the DTaP shots) start when kids are only 2 months old (definitely no earlier than 6 weeks). Adolescents get a booster Tdap shot at around 11-12 years (if they miss it, it's OK for them to get Tdap between 13-18 years). Adults should get a Tdap shot for one of their tetanus boosters. The others will all be Td shots. Remember, you need a tetanus booster every 10 years. If you are over 65 years old you might not need the Tdap shot, but you can still get one. You should talk to your doctor.
April 20, 2009 â The tetanus toxoid/reduced diphtheria toxoid/acellular pertussis single-dose booster vaccine (Tdap; Boostrix, GlaxoSmithKline Biologicals) was approved for an expanded age indication (10 â 64 years) by the US Food and Drug Administration (FDA), on December 4, 2008, according to an article published in the April 17 issue of the Morbidity and Mortality Weekly Report.