Presentation is loading. Please wait.

Presentation is loading. Please wait.

Beath High School - Int 1 Physics1 Intermediate 1 Physics Electronics Questions and Answers.

Similar presentations


Presentation on theme: "Beath High School - Int 1 Physics1 Intermediate 1 Physics Electronics Questions and Answers."— Presentation transcript:

1 Beath High School - Int 1 Physics1 Intermediate 1 Physics Electronics Questions and Answers

2 Beath High School - Int 1 Physics2 Intermediate 1 Physics Electronics Q 1 to 9 Q 10 to 18

3 Beath High School - Int 1 Physics3 1.Describe what is meant by an electronic system. Give two examples An electronic system is made up from lots of electronic components to do a particular job. Two examples of electronic systems are a calculator and a public address system. Electronic Systems

4 Beath High School - Int 1 Physics4 2.The block diagram for a calculator is shown below. Identify the input, process and output subsystems. InputProcessOutput

5 Beath High School - Int 1 Physics5 3.Draw a block diagram of each of the following systems. Identify the input, process and output subsystems in each case. (a) A public address system (b) A smoke alarm

6 Beath High School - Int 1 Physics6 (c) An automatic porch light (lamp lights when it gets dark) (d) An automatic fan (fan operates when it gets too warm)

7 Beath High School - Int 1 Physics7 (e) A radio.

8 Beath High School - Int 1 Physics8 4. What is sensed by each of the following input devices (c) light dependent resistor (b) thermistor (a) microphone (d) switch sound heat light pressure

9 Beath High School - Int 1 Physics9 5.What can change the resistance of a thermistor? As the light level increases the resistance decreases 6. State how the resistance of a light dependent resistor changes with light level. Change in temperature 7. Describe an experiment you would perform to determine how the resistance of a thermistor changes with temperature. Connect a thermistor to a resistance meter and heat the thermistor gently with your fingers. Watch what happens to the resistance on the meter.

10 Beath High School - Int 1 Physics10 8.Describe an experiment you would perform to determine how the resistance of a light dependent resistor changes with light level Connect the microphone to the input of the oscilloscope. Speak into the microphone. You will see a wave pattern on the screen which matches your voice. 9. Describe how you would use an oscilloscope to examine the output signal from a microphone. Describe what is seen on the oscilloscope screen. Connect a LDR to a resistance meter and cover it over with your hand. Watch what happens to the resistance on the meter.

11 Beath High School - Int 1 Physics Describe the energy changes which take place in the following output devices: electrical energy to light energy loudspeaker buzzer lamp light emitting diode (LED) electric motor electrical energy to sound energy electrical energy to light energy electrical energy to kinetic energy

12 Beath High School - Int 1 Physics Study the circuit symbols below. In each case: (a) name the device (b) state whether it is an input or output device (c) state the energy changes in the device (d) give an example of where it could be used device 1 (a) microphone (b) input device (c) sound energy to electrical energy (d) input to a public address system

13 Beath High School - Int 1 Physics13 device 2 (a) buzzer (b) output device (c) electrical energy to sound energy (d) warning device on a freezer, if temperature inside rises above a particular temperature device 3 (a) motor (b) output device (c) electrical energy to kinetic energy (d) output for a room cooling system

14 Beath High School - Int 1 Physics14 device 4 (a) thermistor (b) input device (c) heat energy to electrical energy (d) input device on a freezer, to check temperature inside does not rises above a particular temperature device 5 (a) light emitting diode (b) output device (c) electrical energy to light energy (d) indicates that something is switched on

15 Beath High School - Int 1 Physics15 device 6 (a) lamp (b) output device (c) electrical energy to light energy (d) output device for an automatic light which switches on when it gets dark device 7 (a) loudspeaker (b) output device (c) electrical energy to sound energy (d) output device for a radio, so that we can hear the music.

16 Beath High School - Int 1 Physics16 device 8 (a) light dependent resistor (b) input device (c) light energy to electrical energy (d) input device for an automatic light which switches on when it gets dark 12. In the applications below identify which of the devices in Q 11 would be suitable. Give a reason for the choice of each device. (a) Output of a radio Loudspeaker, it changes the electrical energy form the amplifier to sound energy

17 Beath High School - Int 1 Physics17 (b) Input of an automatic lamp LDR, because its resistance changes as the light level changes (c) Input of a heating controller Thermistor, because its resistance changes as the temperature changes (d) Output of a fan Motor, because it will turn the fan. (e) Output of an electronic timer Light emitting diode, it can form the part of a seven segment display to show the numbers. (f) Input of a cassette recorder – recorder subsystem Microphone, it will pick up the sound to be recorded.

18 Beath High School - Int 1 Physics18 (g) Output of a cassette recorder – drive subsystem. Motor, it will turn the spindles. (h) Output of a cassette recorder – play back system Loudspeaker, it will change the electrical energy back into sound energy. 13. Describe what is meant by a “digital signal”. A digital signal is either on or off

19 Beath High School - Int 1 Physics19 14.Draw an oscilloscope trace of a digital signal

20 Beath High School - Int 1 Physics20 15.Draw the symbol for each of the following logic gates: (a) NOT gate or Inverter (b) AND gate (c) OR gate

21 Beath High School - Int 1 Physics The following is a truth table for a logic gate. A NOT gate or inverter (a) Name the logic gate. (b) Explain in terms of voltage levels, what is meant by the “1”s and “0”s. InputOutput “1” is a high voltage, “0” is a low voltage

22 Beath High School - Int 1 Physics For each of the logic gates shown below: (a) Name the gate (b) Draw the truth table (c) Describe the operation of the gate in words. (a) NOT gate or inverter (c) The output of the NOT gate is always the opposite of the input Gate 1 InputOutput (b)

23 Beath High School - Int 1 Physics23 (a) AND gate (c) The AND gate combines the input signals so that the output is only 1 when both inputs are 1. Input B Output (b) Input A Gate 2 A B

24 Beath High School - Int 1 Physics24 (a) OR gate (c) The output of an OR gate is ‘1’ when any input is ‘1’. Input B Output (b) Input A Gate 3 A B

25 Beath High School - Int 1 Physics The system below is designed to allow water to be sprayed on to plants if the air becomes too hot or the gardener switches the sprayer on. (a) Name the logic gate used in the system. Thermistor Heat sensor 1 = hot 0 = cold Motor to operate sprayer switch A B (b) The gardener switches the the sprayer on. What is the logic level at B? (c) What input device could be used in the heat sensor? OR gate Logic 1

26 Beath High School - Int 1 Physics26 Intermediate 1 Physics Electronics End of Questions and Answers


Download ppt "Beath High School - Int 1 Physics1 Intermediate 1 Physics Electronics Questions and Answers."

Similar presentations


Ads by Google