Electricity Past Paper PDF - Ohm's Law
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This document is an activity on Ohm's law, involving circuits, ammeters, voltmeters, and a nichrome wire. It encourages students to observe relationships in electric circuits, set up circuits, and graph V vs I. It appears to be part of a larger physics curriculum.
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7 Electric bulb or 8 A resistor of resistance R 9 Variable resistance or rheostat or 10 Ammeter 11 Voltmeter 11.4 OHM’S LA LAWW Is there a relationship between th...
7 Electric bulb or 8 A resistor of resistance R 9 Variable resistance or rheostat or 10 Ammeter 11 Voltmeter 11.4 OHM’S LA LAWW Is there a relationship between the potential difference across a conductor and the current through it? Let us explore with an Activity. Activity 11.1 n Set up a circuit as shown in Fig. 11.2, consisting of a nichrome wire XY of length, say 0.5 m, an ammeter, a voltmeter and four cells of 1.5 V each. (Nichrome is an alloy of nickel, chromium, manganese, and iron metals.) n First use only one cell as the source in the circuit. Note the reading in the ammeter I, for the current and reading of the voltmeter V for the potential difference across the nichrome wire XY in the circuit. Tabulate Figure 11.2 Electric circuit for studying Ohm’s law them in the Table given. n Next connect two cells in the circuit and note the respective readings of the ammeter and voltmeter for the values of current through the nichrome wire and potential difference across the nichrome wire. n Repeat the above steps using three cells and then four cells in the circuit separately. n Calculate the ratio of V to I for each pair of potential difference V and current I. S. Number of cells Current through Potential difference V/I No. used in the the nichrome across the (volt/ampere) circuit wire, I nichrome (ampere) wire, V (volt) 1 1 2 2 3 3 4 4 n Plot a graph between V and I, and observe the nature of the graph. Electricity 175 2024-25
