The voltmetor measures the potential difference betwcon a pair of nodos of an electric circuit. The voltmeter is connected in parallel with the portion of the circuit between the pair of nodes as illustrated in Figure 8(b). This measurement can be achieved only if no current flows through the voltmeter. Therefore, the ideal voltmeter should rospond as an open circuit to the node pair (Rin oo). An ohmmeter is usually embedded within a voltmeter; hence, it is connected in parallel with the resistance to be measured.