68 Simpte Resistive citcujts Figurc 3.21 A An ammeter connected to measure the curent in Rr. and a voLtmeter connected to measure theFigue 3.22 A A short-circujt modet for the jdeat ammeier, and an open'circuit modeLtotthe jdeatvoLtmeter.Figue 3.23 A A sch€matjc diagram 0f a dl\rsonvat tigue 3.24 A A dc ammeter crrujt.3.5 Measuring Vottage and €urrentWhen working with actual circuits, you will oJten need to measue volt-ages and cullents. we will spend some time discussing several measuringdevices here and il the next section, because they are relatively simple toanalyze and offer practical examples of the curent- and voltage-dividerconfigurations we have just studied. An .nmet€r is an hsuument designed to measue curent;it is placedin seies with the circuit element whose cuuent is being measured Avoltrnet€r is an instument d€signed to measure voltage;it is placed in par'allel with the element whose voltage
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