Lowers Recommended Lead-Level Limits in Children. For the first time in 20 years, federal health authorities have lowered the recommended limit for lead exposure in young children, which they say could add 200,000 children to those believed to have unsafe lead levels in their blood.
Electrical Units of Measure. The standard SI units used for the measurement of voltage, current and resistance are the Volt [ V ], Ampere [ A ] and Ohm [ Ï ] respectively.
A mA, or milliamp, is 1/1000th of an amp, a measure of the flow of electrical current. It helps to think of electricity as water flowing down a pipe - the voltage is like the water pressure, the current (mA) is the amount of water flowing, and the resistance is the width of the pipe. Too much voltage can burn out your electronics, just like too much water pressure can burst your pipes.