1. The 3 parts of an electronic system are :10
Seconds
Remaining
The 3 parts of an electronic system are :
Input , Output and Throughput
Output , Process and Throughput
Process , Output and Throughput
Input, Process and Output

2. All output devices turn :
20 Seconds
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All output devices turn :
Electrical energy into sound energy
Sound into electrical energy
Light into electrical energy
Electrical energy into some other form

3. 20
Seconds
Remaining
Loudspeakers :
Turn electrical energy into sound and can be used in a DVD recorder
Turn sound into electrical energy and can be used in a television
Turn sound into electrical energy and can be used in a DVD recorder
Turn electrical energy into sound and can be used in a television

4. The main energy change in an electrical motor is :
15 Seconds
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The main energy change in an electrical motor is :
Electrical energy into kinetic energy
Electrical energy into kinetic and sound energy
Electrical energy into kinetic , heat and sound energy

5. A relay is :
An analogue device which uses a small current to switch a bigger one on
A digital device which uses a large current to switch a smaller one on
A digital device that uses a small current to switch a larger one on
An analogue device that uses a large current to switch a smaller one on
:20

6. 7 segment display, Digital Relay, Digital
20 Seconds
Remaining
The most suitable output device to lock all the doors in central locking system is :
Led , Analogue
Solenoid, Digital
7 segment display, Digital
Relay, Digital

7. 20
Seconds
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LEDs :
Turn electrical energy into light and give out lots of colours of light
Turn electrical energy into light and can be connected either way in a circuit
Turn electrical energy into light and have a lens fitted to them
Turn electrical energy into light and heat energy

8. LEDs have a protecting resistor fitted to :
20 Seconds
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LEDs have a protecting resistor fitted to :
Increase the size of the current
Control the size of the current flowing through the LED
Increase the voltage across the LED
Complete the circuit

9. The voltage across the LED is:90

10. 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.
100 Ω
0.01 Ω
200 Ω
300 Ω 90

11. 7 segment displays are Analogue devices used in monitors20
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7 segment displays are
Analogue devices used in monitors
Digital devices used in DVD recorders
Analogue devices used in DVD recorders
Digital devices used monitors