A student investigates a light-dependent resistor (LDR). The student assembles a series circuit consisting of a power supply, a switch, a $$\(470 \Omega\)$$ resistor and an LDR. When the LDR is covered by the card, the current in the circuit changes. Use the student's results from (b)(ii), (d) and (e)(i) to show how this change in current affects the value of the total potential difference ( $$\(V_{X Y}+V_{Y Z}\)$$ ). . .

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