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, the basic unit of electrical resistance--is the opposition to the flow of free electrons in a circuit. Measuring the DC resistance through a transformer's winding is an easy way to judge the condition of a transformer without applying power to it.nstructions. Disconnect the transformer from the circuit before testing it. A transformer's winding forms a parallel connection with the circuit, and unless you disconnect at least one leg, you will get a false reading. Set up the DMM to read resistance and select an appropriate resistance range.