Twenty Questions Electronics.

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Presentation transcript:

Twenty Questions Electronics

Twenty Questions 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Resistance has decreased as the current has increased. 1. At the start of the experiment, the ammeter reading is 0.02A, at the end it is 0.15A Explain whether the resistance of the component show has increased or decreased. Resistance has decreased as the current has increased. I=V/R, where V is constant.

2. Of what 3 main parts does an electronic system consist? Input Process Output

3. Name the component & explain how it works. Thermistor Temperature Up Resistance Down

4. Select suitable input and output devices for a baby monitor. Input – Microphone Output - Loudspeaker

5. Give 3 analogue input devices Dimmer switch. Volume control on radio. Heat dial on cooker.

6. What is 0 1 0 1 in decimal? 5

7. Name & state the function of the component. Transistor Electronic switch which automatically switches ON at 0.7V.

Less heat produced. Lower energy usage. Smaller. 8. Why would you use an LED instead of a filament to indicate that an electrical appliance was switched on? Less heat produced. Lower energy usage. Smaller.

9. Calculate the current if the light level is 25lux. Resistance 15 120 20 80 25 60 I = V/R I = 9/60 I = 0.15A

10. How can the frequency of a clock pulse generator be increased? Decrease the value of the capacitor Decrease the value of the resistor.

11. Name the component & explain how it works. LDR (light dependent resistor) Light Up Resistance Down

12. Give the energy change for the following. Solar cell Microphone Thermistor LDR Light Electrical Sound Electrical Heat Electrical

13. The LED has a voltage 2V. What is the value of R? VR = 12-2 =10V R = VR / I = 10/2.5 = 4Ω

14. Give an example of a time delay circuit. Interior light in car staying on for a few seconds after the door has been closed.

15. What is 6 in binary? 0 1 1 0

16. What happens to the value of V2 as R1 increases? V2 decreases

17. If R1=10kΩ and R2=2.5kΩ calculate V2.

18. Which component does the graph represent? Voltage 18. Which component does the graph represent? Capacitor.

19. Name the type of device which produces the output shown. Digital

20. Give the energy change for the following. Electrical Light Electrical Kinetic Electrical Sound LED Solenoid Relay Loudspeaker