A 12 volt supply is in series with a resistor and an LDR. In light, the LDR has a potential difference of 3.0 volts and in the dark it has a potential difference of 6.0 volts. Find the ratio of the series resistor to the resistance of the LDR in light.
Assuming there is no other resistance in the circuit
Sum of p.d. across LDR and resistor is
Where voltage
In light p.d across LDR
across R
Ratio of voltage
Ratio of resistance
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