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Questions on EMF and internal resistance

Q9.

(a) A student is given three resistors of resistance 3.0 , 4.0 and 6.0 respectively.

(i) Draw the arrangement, using all three resistors, which will give the largest resistance.

(ii) Calculate the resistance of the arrangement you have drawn.

(iii) Draw the arrangement, using all three resistors, which will give the smallest resistance.

(iv) Calculate the resistance of the arrangement you have drawn.

(5)

(b) The three resistors are now connected to a battery of EMF 12 V and negligible internal resistance, as shown in the diagram below.

(i) Calculate the total resistance in the circuit.

(ii) Calculate the voltage across the 6.0 resistor.

(4)

(Total 9 marks)