Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 121 · 40 questions

Robot tip (Spin or point): DC motor: spins continuously; swap its wires to reverse it. Servo: goes to a set angle between 0° and 180°. Servo turn = bigger angle − smaller angle (30° to 120° = 90°). A program like angle = 90, angle = angle + 30 adds and takes away degrees in order.

1. 1.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
2. 2.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a fan (d) a servo motor
3. 3.🦾 A servo program runs:
   angle = 160
   angle = angle − 60
   angle = angle + 40
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
4. 4.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
5. 5.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
6. 6.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
7. 7.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
8. 8.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
9. 9.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) light (d) sound only
10. 10.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a DC motor (d) a buzzer
11. 11.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points straight up (b) points right (c) points up and left (d) points left
12. 12.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
13. 13.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
14. 14.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points up and right (b) points right (c) points left (d) points straight up
16. 16.🦾 A servo program runs:
    angle = 180
    angle = angle − 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
17. 17.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
18. 18.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) shake it (d) paint it red
19. 19.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
20. 20.🦾 A servo program runs:
    angle = 160
    angle = angle − 60
    angle = angle − 20
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
21. 21.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
22. 22.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
23. 23.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
24. 24.🦾 A servo program runs:
    angle = 30
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo program runs:
    angle = 80
    angle = angle − 20
    angle = angle + 60
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
26. 26.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
27. 27.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
28. 28.🦾 A servo moves from 90° to 0°. How many degrees does it turn?
29. 29.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle − 10
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo program runs:
    angle = 90
    angle = angle + 40
    angle = angle − 60
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
31. 31.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 180° (d) 1800°
32. 32.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo moves from 160° to 0°. How many degrees does it turn?
34. 34.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
35. 35.🦾 A servo program runs:
    angle = 60
    angle = angle − 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
37. 37.🦾 A servo program runs:
    angle = 120
    angle = angle − 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
38. 38.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
39. 39.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points left (b) points up and right (c) points right (d) points up and left
40. 40.🦾 A servo moves from 80° to 70°. How many degrees does it turn?

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