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how can I do 2(a)?

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2019-204
/ Science
Page 1
2. Amy designs the following circuit to control the brightness of a light bulb. However, the
the right.
brightness of the bulb remains unchanged when she moves the sliding contact to the left or to
Left
sliding contact
Right
PH
R
(a) Based on the above circuit, explain why the brightness of the bulb remains unchanged when
Amy moves the sliding contact.
(3 marks)
(b) Which two terminals, among P, Q and R, should Amy connect so that she could control
the brightness of the bulb by moving the sliding contact?
(1 mark)
(c) Based on your answer in (b), to which direction should Amy move the sliding contact in
Z order to dim the bulb?
(1 mark)
the

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Subject: Physics, Science

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