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Question 4 (Total of 10 marks) Figure 4.1 12.0 V www 1.5 Ω 2.5 Ω www 4.8 Ω www 3.3 Ω 8.1 Ω a. Refer to the circuit provided in Figure 4.1. Determine the following: (i) The equivalent resistance of the entire circuit. (ii) What is the total current flowing through the power source? (iii) What is the current flowing through the 2.5 resistor? (iv) What is the voltage across the 6.3 resistor? (v) What is the current flowing through the 3.3 2 resistor? ww 6.3 Ω (4 × ½ mark) (2 x ½ mark) (2 x 1 mark) (4 × ½ mark) (4 × ½ mark) b. When a potential difference of 12.0 V is applied to a wire 6.9 m long and 0.33 mm in diameter, the result is an electric current of 2.1 A. What is the resistivity of the wire? (4 × ½ mark)