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 Form 3 Physics Current Electricity II Questions and Answers

(a) Figure 8 shows a graph of potential difference V (volts) against a current, I (amperes) for a certain device. From the graph:
graph4222020219.png
(i) State with a reason whether or not the device obeys Ohm’s law (ii) Determine the resistance of the device at;
(I) I = 1.5 A (II) I = 3.5 A (iii) From the results obtained in (ii), state how the resistance of the device varies the current increases. (iv) State the cause of this variation in resistance.
(b) Three identical dry cells each of e.m.f. 1.6V are connected in series to a resistor of 11.4 Ohms. A current of 0.32 Ohms flows in the circuit. Determine:
(i) The total e.m.f. of the cells
(ii) The internal resistance of each cell.

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