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.
Current is measure with an ammeter, ammeters are always connected in series with the component of interest. Potential differences are measured using a voltmeter, voltmeters are connected in parallel with the component of interest. By measuring the current and potential difference you can calculate the resistance.