Transcript The energy change in a thermocouple is

The energy change in a
thermocouple is :
0%
0%
0%
0%
1.
2.
3.
4.
EE to EH
ES to EE
EL to EE
EH to EE
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The resistance of an LDR
0%
0%
0%
0%
1.
2.
3.
4.
Increases as temperature decreases
Decreases as light level decreases
Increases as light level decreases
Decreases as temperature increases
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The resistance of the LDR is :
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0%
0%
0%
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2.
3.
4.
0.05 
500 
20 
0.02 
5V
10 mA
0V
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When a capacitor charges up
0%
0%
0%
0%
1. The voltage across it decreases but
the charge stored increases
2. The voltage across it increases and
the charge stored increases
3. The voltage across it decreases and
the charge stored decreases
4. The voltage across it increases and
the charge stored decreases
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The correct input device to
supply a time delay is :
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0%
0%
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2.
3.
4.
Solar cell
Microphone
Thermistor
Capacitor
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The voltage across the 20
resistor is :
0%
0%
0%
0%
1.
2.
3.
4.
5V
4V
1V
25 V
5V
80
20
0V
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To decrease the time delay in
an alarm circuit you would :
33%
33%
33%
1. Increase the capacitance
2. Decrease the capacitance
3. Increase the resistance
Vout
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What happens to Vout as light
level falls ?
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0%
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0%
1.
2.
3.
4.
Vout
Vout
Vout
Vout
increases as RLDR decreases
decreases as RLDR decreases
increases as RLDR increases
decreases as RLDR decreases
5V
Vout
0V
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What happens to Vout as
temperature increases ?
0%
0%
0%
0%
1.
2.
3.
4.
Vout decreases as Rth increases
Vout decreases as Rth decreases
Vout increases as Rth decreases
Vout increases as Rth increases
5V
Vout
0V
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Explain what happens to Vout when
the current is switched on
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0%
0%
0%
1.
Vout decreases as the capacitor
discharges
2. Vout increases as the capacitor charges
3. Vout increases as the capacitor discharges
4. Vout decreases as the capacitor charges
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