A Light Dependent Resistor (LDR) is used to turn on an outside lamp when it gets dark. Part of the circuit is shown in Figure 2.A student investigated how – 6035

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Q1

A Light Dependent Resistor (LDR) is used to turn on an outside lamp when it gets dark. Part of the circuit is shown in Figure 2.

Calculate the current through the LDR when the resistance of the LDR is 5000 

Ω. Give your answer to 2 significant figures. 

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Current = _______________________ A (4)

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4 thoughts on “A Light Dependent Resistor (LDR) is used to turn on an outside lamp when it gets dark. Part of the circuit is shown in Figure 2.A student investigated how – 6035”

  3. Given:
    12 = I × 7000
    Rearrange the formula to find I:
    I = 12 / 7000
    I = 0.0017142857… A
    Round to 2 significant figures:
    I = 1.7 × 10⁻³ A
    Final Answer:
    I = 1.7 × 10⁻³ A

    Reply

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