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.
Consider the resistor that you want to calculate the voltage across. Suppose, as an example, that you are considering a 4 Ohm resistor. Measure the current passing through the wire in the circuit immediately after the resistor. Use a multimeter or ammeter to measure the current.