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.
Resistance, measured in Ohms, tells us how hard it is for a current to flow through a circuit component. The size of the current flowing depends on the potential difference (voltage [voltage: The potential difference of a cell, electrical supply or electric component.It is measured in volts, 'V'.esistance, measured in Ohms, tells us how hard it is for a current to flow through a circuit component. The size of the current flowing depends on the potential difference (voltage [voltage: The potential difference of a cell, electrical supply or electric component.