Which symbol is used to show an LDR?
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Simple Circuits
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Simple Circuits
Which symbol is used to show an LDR?
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A student sets up four different circuits. He uses identical lamps and the same cell.
Look at the diagrams of his circuits.
Which circuit has the brightest lamp(s)?
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A student sets up the following circuit to investigate the I-V characteristics of a filament lamp.
What is the independent variable in this investigation?
Potential difference
Current
Resistance
Time
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Look at the circuit diagram.
resistance = potential difference ÷ current
Calculate the resistance of bulb D.
2 Ω
4 Ω
6 Ω
8 Ω
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A student investigates how current and potential difference vary in different components.
Look at the graphs of her results.
Which graph shows a filament lamp?
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A student investigates how the resistance of a light dependent resistor (LDR) changes with light intensity.
Which graph shows the correct relationship between the resistance of an LDR and light intensity?
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Which of the following statements about circuit components is correct?
For a light dependent resistor, the resistance decreases as light intensity decreases.
For a thermistor, the resistance decreases as temperature increases.
For a filament lamp, current and potential difference are directly proportional.
For a diode, current will only flow in the circuit when the diode is positioned in reverse bias.
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The diagram shows the circuit symbol of a component.
Which of the following is an application of this circuit component?
Thermometer
Dimmer switch
Automatic lights
Car headlights
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A student set up the following circuit.
The student has made a number of mistakes in setting up the circuit. Which of the following is a mistake made by the student that also affects the amount of charge flowing around the circuit?
The ammeter is placed in parallel.
The voltmeter is placed in series.
The variable resistor is placed before the lamp.
The diode is facing the wrong way.
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Here are some graphs for the potential difference (p.d.) of four electrical supplies.
Which graph shows a direct voltage?
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