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Figure 9 shows the graph of the relationship between current I and potential difference V and lamp Y are 2.5 V and 3.0 V respectively.
(a) Explain the change in the shape of the curves as the current increases.
(b) Determine the resistance of lamp X at
the normal working voltage.
(c) The lamps are now connected in a series circuit in which a current of 0.4 A flows. Find the potential differences across lamp Y.
(d) Determine the power at which lamp Y operates under normal working voltage.
