A wire mounted on a millimeter scale and labeled X RACH 2011 Form Four Physics

# A wire mounted on a millimeter scale and labeled x

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A wire mounted on a millimeter scale and labeled X © RACH – 2011 Form Four Physics 232/3 3

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A switch Ammeter Voltermeter 2 cell holders 3 New size D dry cells Seven connecting wires, three with crocodile clips at both ends. Jockey Key. Proceed as follows: a)Connect the circuit as shown in the figure below. b) Adjust the contact Q so that the reading on the voltmeter is 1.5V, note the reading of the current and record in the table below. c) Repeat the procedure above for the values of voltage given in the table and record the corresponding values of the current. (7mks) P.d V (v) 1.5 1.4 1.3 1.2 1.1 1.0 0.9 Current,I (A) d) Plot a graph of voltage (V) (y-axis) against current , I (A) (5mks e) Determine the slope of the graph. (3mks) f) State the equation relating the voltage (V), the internal resistance r, and the e.m.f of the cell. (2mks) …………………………………………………………………………………………………..……… …………………………………………………………………………………………………… .... ….. g) From the graph determine the values of; i) The e.m.f (E) of the cell. (1mk) ii) The internal resistance , r, of the cell. (2mks) © RACH – 2011 Form Four Physics 232/3 4 Wire X Jockey Key s P Q A V
© RACH – 2011 Form Four Physics 232/3 5
• Fall '18
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