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The 3 parts of an electronic system are :
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Input , Output and Throughput
Output , Process and Throughput
Process , Output and Throughput
Input, Process and Output
All output devices turn :
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Electrical energy into sound energy
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Sound into electrical energy
Light into electrical energy
Electrical energy into some other
form
Loudspeakers :
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1. Turn electrical energy into sound and can be
used in a DVD recorder
2. Turn sound into electrical energy and can be
used in a television
3. Turn sound into electrical energy and can be
used in a DVD recorder
4. Turn electrical energy into sound and can be
used in a television
The main energy change in an
electrical motor is :
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Electrical energy into kinetic energy
2. Electrical energy into kinetic and sound
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energy
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sound energy
A relay is :
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1. An analogue device which uses a small
current to switch a bigger one on
2. A digital device which uses a large
current to switch a smaller one on
3. A digital device that uses a small current
to switch a larger one on
4. An analogue device that uses a large
current to switch a smaller one on
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The most suitable output device to lock all the
doors in central locking system is :
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Led , Analogue
Solenoid, Digital
7 segment display, Digital
Relay, Digital
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LEDs :
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1. Turn electrical energy into light and give
out lots of colours of light
2. Turn electrical energy into light and can
be connected either way in a circuit
3. Turn electrical energy into light and
have a lens fitted to them
4. Turn electrical energy into light and heat
energy
LEDs have a protecting resistor fitted to :
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1. Increase the size of the current
2. Control the size of the current flowing
through the LED
3. Increase the voltage across the LED
4. Complete the circuit
The voltage across the LED is:
1. 6 V
2. 0V
3. 4.1 V
4. 0.9V
9V
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6
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90
A current of 20 mA flows through the LED when the
voltage across it is 2V. Calculate the value of the
protecting resistor when the LED is wired to a 6V
supply.
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1. 100 Ω
2. 0.01 Ω
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3. 200 Ω
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4. 300 Ω
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7 segment displays are
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Analogue devices used in monitors
Digital devices used in DVD recorders
Analogue devices used in DVD recorders
Digital devices used monitors