Current produced by thermocouples. My understanding is that the thermocouple voltage is strictly a function of the temperature. Apparently this is called the Seebeck Voltage. Like any voltage source there is an internal resistance associated with it due to real world effects.
HIV/AIDS. Condoms for HIV prevention. Condoms, when used correctly and consistently, are highly effective in preventing HIV and other sexually transmitted infections (STIs). A large body of scientific evidence shows that male latex condoms have an 80% or greater protective effect against the sexual transmission of HIV and other STIs.
Condoms at a Glance. Worn on the penis. Made of latex or plastic. Prevent pregnancy and sexually transmitted infection. Can be used with another form of birth control for extra protection. Can be used for vaginal, anal, or oral sex. Safe, effective, and easy to get.