You are given a resistance wire AB connected with a cell and a key as shown in Fig. 9.14. You are required to measure the current in the wire AB and potential difference across it. Name the instruments that you would use and draw a labelled diagram to show how are they connected, Also mark the direction of current in each component.
You are given a resistance wire AB connected with a cell and a key as shown in Fig. 9.14. You are required to measure the current in the wire AB and potential difference across it. Name the instruments that you would use and draw a labelled diagram to show how are they connected, Also mark the direction of current in each component.
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To measure current, an ammeter is used and to measure the potential difference, a voltmeter is used. The ammeter (A) is connected in series with the resistance wire AB and cell, while the voltmeter (V) is connected in parallel across the wire AB. Care is taken that + marked terminal of ammeter (A) and voltmeter (V) is joined to the side of + ve terminal of cell. The completed diagram is given below in Fig. 2. The arrow marked in the diagram shows the direction of current.
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