Fig. 6.1 shows an electric circuit containing a filament lamp, a resistor R, a 12V battery and five meters. [Figure 6.1]

1. (a)(i)The reading on ammeter A₁ is 0.25A. The reading on voltmeter V₁ is 3.0V. Determine the readings on the other meters. reading on ammeter A₂ = ................................................. A reading on ammeter A₃ = ................................................. A reading on voltmeter V₂ = ................................................. V[2]
2. (a)(ii)Calculate the resistance of resistor R. resistance of resistor R = ................................................. Ω[2]
3. (a)(iii)The resistor obeys Ohm's law. State Ohm's law.[2]
4. (b)Fig. 6.2 shows the current-voltage graph for the filament lamp. [Figure 6.2] The battery in Fig. 6.1 is replaced with a different battery which has a different e.m.f. (electromotive force). The voltage across the lamp increases to 6.0V. Use data from the graph to determine the e.m.f. of the second battery. Show your working. e.m.f. = ................................................. V[3]

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