A potential divider consists of a fixed resistor R and a light-dependent resistor (LDR). What happens to the voltmeter reading, and why does it happen, when the intensity of light on the LDR increases?
The voltmeter reading increases because the LDR resistance increases.
The voltmeter reading decreases because the LDR resistance decreases.
The voltmeter reading increases because the LDR resistance decreases.
The voltmeter reading decreases because the LDR resistance increases.
A galvanometer has an internal resistance of 100 Ohms and deflects full-scale at 2.00 mA. What size resistor should be added to it to convert it to a milliammeter capable of reading up to 4.00 mA?
50.0 Ohms in series.
50.0 Ohms in parallel.
100 Ohms in parallel.
100 Ohms in series.
The diagram shows an arrangement of resistors. What is the total electrical resistance between X and Y?
40 ohms.
Between 10 ohms and 30 ohms.
7.5 ohms.
Less than 1 ohm.
What current flows in the 12 ohms resistor in the circuit below:
0.75 A.
0.25 A.
1.0 A.
0.50 A.
