Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 236 · 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.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
2. 2.🦾 A servo program runs:
   angle = 0
   angle = angle + 20
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
3. 3.🦾 A servo program runs:
   angle = 60
   angle = angle + 10
   angle = angle + 20
   angle = angle + 10
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
4. 4.🦾 A servo program runs:
   angle = 50
   angle = angle + 20
   angle = angle + 50
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
5. 5.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
6. 6.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
8. 8.🦾 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 up and left (b) points up and right (c) points straight up (d) points left
9. 9.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
10. 10.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a DC motor (d) a fan
11. 11.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
12. 12.🦾 A servo moves from 60° to 100°. How many degrees does it turn?
13. 13.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
14. 14.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
15. 15.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
16. 16.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
17. 17.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
18. 18.🦾 A servo moves from 160° to 170°. How many degrees does it turn?
19. 19.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) swap its two wires (d) add more wheels
20. 20.🦾 A servo moves from 90° to 140°. How many degrees does it turn?
21. 21.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
23. 23.🦾 A servo moves from 20° to 70°. How many degrees does it turn?
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
25. 25.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points straight up (b) points up and left (c) points right (d) points left
26. 26.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
27. 27.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
28. 28.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
29. 29.🦾 A servo moves from 100° to 0°. How many degrees does it turn?
30. 30.🦾 A servo program runs:
    angle = 120
    angle = angle + 60
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
31. 31.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
32. 32.🦾 A servo moves from 150° to 130°. How many degrees does it turn?
33. 33.🦾 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 left (b) points right (c) points up and left (d) points up and right
34. 34.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
35. 35.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
36. 36.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
37. 37.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
39. 39.🦾 A servo program runs:
    angle = 160
    angle = angle − 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo program runs:
    angle = 30
    angle = angle − 20
    angle = angle + 20
    angle = angle + 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?

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