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Name the missing part in this electronic system.(1)

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Which output devices are analogue? (2)

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Name a suitable output device for a radio receiver.(1)

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a) Complete this circuit with an LED that will light.(1)
b) Why is a series resistor R required? (1)
c) The LED operates at 2 V and 10 mA.
Calculate the value of resistor R.(3)

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What name is given to this type of display used to show numbers? (1)

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State one advantage that an LED has over a light bulb.(1)

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State the energy change that takes place in
a) microphone
b) thermocouple
c) solar cell.(3)

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What happens to the resistance of an LDR as the light intensity increases?(1)

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What changes the resistance of a thermistor?(1)

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Calculate the values of V₁ and V₂.(3)

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Calculate V₁ when the temperature is 25 ° C.(3)

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Draw the circuit symbols for
a) microphone
b) thermocouple
c) solar cell
d) thermistor
e) LDR
f) switch
g) capacitor.(7)

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Which input device could be used to make a timer circuit for a clothes dryer?(1)

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Which input device could be used as part of a circuit to switch on street lights when it gets dark?(1)

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a) Sketch a graph for the capacitor charging up.(2)
b) What two changes could be made to the circuit to increase the charging time of the capacitor?(2)

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