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(a) State Ohm’s law. (b) The graph in figure 9 shows the current – voltage characteristics of a certain device, X. (i) State with a reason whether the device obeys Ohm’s law. (ii) Determine the resistance of the device, X, when the
current through it is 60 mA.
(iii) When the device, X is connected in the circuit below, the voltage across it is 0.70 V.
Calculate the value of the resistance R.
(c) The cell in figure 10 has an e.m.f. of 2.1 V and negligible internal resistance. Determine the: (i) Total resistance in the circuit (ii) Current in the circuit (iii) Reading of the voltmeter.N