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.
DTaP is approved for children under age 7. Tdap, which has a reduced dose of the diphtheria and pertussis vaccines, is approved for adolescents starting at age 11 and adults ages 19 to 64. It is often called a booster dose because it boosts the immunity that wanes from vaccines given at ages 4 to 6.he current recommendation is that one dose of the Tdap vaccine be substituted for one dose of the Td vaccine between the ages of 11 and 64. Pregnant women are also advised to get the Tdap vaccine, preferably between 27 and 36 weeks' gestation.