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P2 Topic 2
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The students found this information relating output current and light intensity (brightness) for a solar cell. The difference in output current between medium light intensity and high light intensity is
A. 5 mA
B. 10 mA
C. 15 mA
D. 25 mA
The current in a lamp is measured by connecting
A. An ammeter in series with the lamp.
B. An ammeter in parallel with the lamp.
C. A voltmeter in series with the lamp.
D. A voltmeter in parallel with the lamp.
The lamps used in these four circuits are identical. Which circuit has the biggest current?
A.
B.
C.
D.
Some students are investigating how current varies with voltage for a resistor. Which circuit should they use?
A.
B.
C.
D.
From the previous question, the students plot this graph. Remember V = I x R. What is the resistance at 4V ?
A. 0.08 Ohms
B. 0.32 Ohms
C.0.5 Ohms
D. 50 Ohms
The graph shows that between 0 and 6 volts the resistance of the resistor is
A. Steadily increasing
B. Constant
C. A maximum at 6 V
D. Proportional to current
Some students are investigating sensors. They find this information about a thermistor. When the temperature increases from 10 deg C to 50 deg C, the resistance will
A. Decrease by about 14 Ohms
B. Decrease by about 18 Ohms
C. Decrease by about 14 000 Ohms
D. Decrease by about 18 000 Ohms
The students make this circuit using the same thermistor. Which row of the table shows the conditions for the highest current in the ammeter?
The light shining on the LDR is bright. The temperature across the thermistor is low.
The light shining on the LDR is bright. The temperature across the thermistor is high.
The light shining on the LDR is dim. The temperature across the thermistor is low.
The light shining on the LDR is dim. The temperature across the thermistor is high.
The voltage across a lamp is 1.5 V. The current in the lamp is 0.3 A. The power supplied to the lamp is: (Power = current x voltage)
A. 0.45 W
B. 0.50 W
C. 4.5 W
D. 5.0 W
An electric shower has a power rating of 6.9 kW. The voltage of the mains supply is 230 V. The current in the shower is about
A. 0.03 A
B. 30 A
C. 33 A
D. 1600 A
Some students investigate how the current in a resistor varies with voltage. Which answer is correct for their investigation?
A. Ammeter in series with the resistor. Voltmeter in series with the resistor.
B. Ammeter in series with the resistor. Voltmeter in parallel with the resistor.
C. Ammeter in parallel with the resistor. Voltmeter in series with the resistor.
D. Ammeter in parallel with the resistor. Voltmeter in parallel with the resistor.
The students plot a graph of their results. The value of the resistor used is; (V = I x R)
A. 0.05 Ohms
B. 1.8 Ohms
C. 2.0 Ohms
D. 20 Ohms
The students investigate how the resistance of a thermistor varies with temperature. They produce this graph. When the students warm the thermistor from 0 ºC to 23 ºC, its resistance
A. Increases by about 10 kOhms
B. Decreases by about 10kOhms
C. Decreases by about 26 kOhms
D. Decreases by about 36 kOhms
In one part of the investigation in the previous question, the current in the thermistor was 0.40 mA and the voltage across it was 8 V. The temperature of the thermistor was about: (V = I x R)
A. 9 deg. C
B. 54 deg. C
C. 60 deg. C
D. 70 deg. C