Diseases that vaccines prevent can be. dangerous, or even deadly. Vaccines greatly. reduce the risk of infection by working with. the bodyâs natural defenses to safely develop. immunity to disease. This fact sheet explains. how the body fights infection and how. vaccines work to protect people by. producing immunity.
Low Voltage Transformers. 1  A low voltage transformer literally transforms the standard line voltage in your home or business (120 or 277 volts) to a lower 12 or 24 volts. This lets you safely supply power to popular low voltage lighting systems like recessed can lights, pendant lights, puck lights and outdoor light fixtures. 123.
PCs a white backlight or sidelight is required for a homogeneous illumination of the LCD colors. The white LED seems to be a good choice for backlight since it requires less power and space compared to the commonly used CCFL (Cold Cathode Fluorescent Light) backlight. The typical forward voltage of a white LED is in the range of 3V to 5V. Since the best choice to power white LEDs is a constant current source and the input voltage range of a Li-Ion battery is below or equal to the LED forward voltage a new power supply solution is required.