The 3 parts of an electronic system are :The 3 parts of an electronic system are :

0%

0%

0%

0% 1.1. Input , Output and ThroughputInput , Output and Throughput

2.2. Output , Process and ThroughputOutput , Process and Throughput

3.3. Process , Output and ThroughputProcess , Output and Throughput

4.4. Input, Process and OutputInput, Process and Output

10Seconds

Remaining

All output devices turn :All output devices turn :

0%

0%

0%

0% 1.1. Electrical energy into sound energyElectrical energy into sound energy

2.2. Sound into electrical energySound into electrical energy

3.3. Light into electrical energyLight into electrical energy

4.4. Electrical energy into some other Electrical energy into some other formform

20 SecondsRemaining

Loudspeakers :Loudspeakers :

0%

0%

0%

0%1.1. Turn electrical energy into sound and can be Turn electrical energy into sound and can be

used in a DVD recorderused in a DVD recorder

2.2. Turn sound into electrical energy and can be Turn sound into electrical energy and can be used in a televisionused in a television

3.3. Turn sound into electrical energy and can be Turn sound into electrical energy and can be used in a DVD recorderused in a DVD recorder

4.4. Turn electrical energy into sound and can be Turn electrical energy into sound and can be used in a televisionused in a television

20Seconds

Remaining

The main energy change in an The main energy change in an electrical motor is :electrical motor is :

0%

0%

0% 1.1. Electrical energy into kinetic energyElectrical energy into kinetic energy

2.2. Electrical energy into kinetic and sound Electrical energy into kinetic and sound energyenergy

3.3. Electrical energy into kinetic , heat and Electrical energy into kinetic , heat and sound energysound energy

15 SecondsRemaining

A relay is :A relay is :

0%

0%

0%

0% 1.1. An analogue device which uses a small An analogue device which uses a small current to switch a bigger one oncurrent to switch a bigger one on

2.2. A digital device which uses a large A digital device which uses a large current to switch a smaller one oncurrent to switch a smaller one on

3.3. A digital device that uses a small current A digital device that uses a small current to switch a larger one onto switch a larger one on

4.4. An analogue device that uses a large An analogue device that uses a large current to switch a smaller one oncurrent to switch a smaller one on

:20

The most suitable output device to lock all the The most suitable output device to lock all the doors in central locking system is :doors in central locking system is :

0%

0%

0%

0% 1.1. Led , AnalogueLed , Analogue

2.2. Solenoid, DigitalSolenoid, Digital

3.3. 7 segment display, Digital7 segment display, Digital

4.4. Relay, DigitalRelay, Digital

20 SecondsRemaining

LEDs :LEDs :

0%

0%

0%

0%1.1. Turn electrical energy into light and give Turn electrical energy into light and give

out lots of colours of lightout lots of colours of light

2.2. Turn electrical energy into light and can Turn electrical energy into light and can be connected either way in a circuitbe connected either way in a circuit

3.3. Turn electrical energy into light and Turn electrical energy into light and have a lens fitted to themhave a lens fitted to them

4.4. Turn electrical energy into light and heat Turn electrical energy into light and heat energyenergy

20Seconds

Remaining

LEDs have a protecting resistor fitted to :LEDs have a protecting resistor fitted to :

0%

0%

0%

0% 1.1. Increase the size of the currentIncrease the size of the current

2.2. Control the size of the current flowing Control the size of the current flowing through the LEDthrough the LED

3.3. Increase the voltage across the LEDIncrease the voltage across the LED

4.4. Complete the circuitComplete the circuit

20 SecondsRemaining

The voltage across the LED is:The voltage across the LED is:

0% 0%0%0%

1.1. 6 V6 V

2.2. 0V0V

3.3. 4.1 V4.1 V

4.4. 0.9V0.9V

90

A current of 20 mA flows through the LED when the A current of 20 mA flows through the LED when the voltage across it is 2V. Calculate the value of the voltage across it is 2V. Calculate the value of the protecting resistor when the LED is wired to a 6V protecting resistor when the LED is wired to a 6V supply.supply.

0%

0%

0%

0%1.1. 100 100 ΩΩ

2.2. 0.01 0.01 ΩΩ

3.3. 200 200 ΩΩ

4.4. 300 300 ΩΩ

90

7 segment displays are7 segment displays are

0%

0%

0%

0% 1.1. Analogue devices used in monitorsAnalogue devices used in monitors

2.2. Digital devices used in DVD recordersDigital devices used in DVD recorders

3.3. Analogue devices used in DVD recordersAnalogue devices used in DVD recorders

4.4. Digital devices used monitorsDigital devices used monitors

20Seconds

Remaining