Resistance
Q1.
(a)  Draw a diagram to show how 1.5 V cells should be connected together to give a potential difference of 4.5 V.
Use the correct circuit symbol for a cell.
 
(2)
A student built the circuit shown in the diagram below.

(b)  Calculate the total resistance of the circuit in the diagram above.
Use the equation:

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Total resistance = _______________________ Ω
(2)
(c)  The resistance of P is 3.5 Ω.
Calculate the resistance of Q.
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Resistance of Q = ______________________ Ω
(1)
(d)  The student connects the two resistors in the diagram above in parallel.
What happens to the total resistance of the circuit?
Tick one box.
 
It decreases		
It increases		
It does not change		
(1)
Give a reason for your answer.
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(1)
(Total 7 marks)