4.3. Electric circuits
A subsection of Physics, 5054, through 4. Electricity and magnetism
Listing 10 of 85 questions
A potential divider is made from a light-dependent resistor (LDR) and a 6.0 kΩ fixed resistor. The potential divider is connected in series with a 12 V d.c. power supply and a voltmeter is connected across the 6.0 kΩ resistor. is the circuit diagram. + – 12 V LDR V 6.0 kŸ A light shines on the LDR. The resistance of the LDR is 2.0 kΩ. Calculate the current in the LDR, current = the reading on the voltmeter. reading = The brightness of the light on the LDR is gradually increased. State and explain what happens to the reading on the voltmeter. Suggest a use for a potential divider made from an LDR and a fixed resistor.
5054_w15_qp_21
THEORY
2015
Paper 2, Variant 1
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Questions Discovered
85