The diagram shows part of a circuit used to switch street lamps on and off automatically.
In the evening it gets dark.
Which row shows the effect on the resistance of the light-dependent resistor (LDR) and on the potential difference (p.d.) across it?
1 )
resistance of LDR:decreases / p.d. across LDR:decreases
2 )
resistance of LDR:decreases / p.d. across LDR:increases
3 )
resistance of LDR:increases / p.d. across LDR:decreases
resistance of LDR:increases / p.d. across LDR:increases
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