Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 353 · 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.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
2. 2.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
3. 3.🦾 A servo program runs:
   angle = 90
   angle = angle + 10
   angle = angle + 40
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
4. 4.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
5. 5.🦾 A servo program runs:
   angle = 110
   angle = angle + 30
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
7. 7.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
8. 8.🦾 A servo program runs:
   angle = 80
   angle = angle − 50
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
9. 9.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
10. 10.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
11. 11.🦾 A servo program runs:
    angle = 100
    angle = angle − 50
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
12. 12.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle − 20
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 A servo moves from 10° to 30°. How many degrees does it turn?
14. 14.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
15. 15.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
16. 16.🦾 A servo moves from 130° to 80°. How many degrees does it turn?
17. 17.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
19. 19.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
20. 20.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle − 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
21. 21.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) paint it red (d) swap its two wires
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
23. 23.🦾 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 straight up (b) points up and left (c) points right (d) points left
24. 24.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) light (d) sound only
25. 25.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points right (b) points left (c) points up and left (d) points up and right
26. 26.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
27. 27.🦾 A servo program runs:
    angle = 120
    angle = angle − 60
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
28. 28.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
29. 29.🦾 A servo moves from 80° to 180°. How many degrees does it turn?
30. 30.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
31. 31.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
32. 32.🦾 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 left (c) points up and left (d) points up and right
33. 33.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
34. 34.🦾 A servo moves from 160° to 0°. How many degrees does it turn?
35. 35.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
36. 36.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
37. 37.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
38. 38.🦾 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 up and right (b) points right (c) points up and left (d) points left
39. 39.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle − 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?

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