Question

1. The circuit below has a battery and six resistors. The value of R1, R2, R3, R4, R5and R6 are respectively 502, 1002, 2000, 4000, 1500 and 750. The voltage

of the battery= 50V a) What is the total resistance of the circuit? b) What is the current going through R1 and R4? c) What is the power expended by R1? d) All the resistors remain at room temperature (20°C) except for R1 which is heated to 50°C. The coefficient of resistivity a = 0.004. What is the resistance of Ri now?(2)

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