Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 55 · 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 drives the wheels? (a) a servo motor (b) a DC motor
2. 2.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
3. 3.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
4. 4.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
5. 5.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
6. 6.🦾 A servo moves from 160° to 170°. How many degrees does it turn?
7. 7.🦾 A servo program runs:
   angle = 90
   angle = angle − 30
   angle = angle + 40
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
9. 9.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
10. 10.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a servo 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 up and left (b) points up and right (c) points right (d) points left
12. 12.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 A servo moves from 90° to 170°. How many degrees does it turn?
14. 14.🦾 A servo moves from 170° to 160°. How many degrees does it turn?
15. 15.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
16. 16.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) shake it (d) swap its two wires
17. 17.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
18. 18.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
19. 19.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°
20. 20.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
21. 21.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
22. 22.🦾 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 up and left (b) points left (c) points right (d) points straight up
23. 23.🦾 A servo moves from 130° to 120°. How many degrees does it turn?
24. 24.🦾 A servo moves from 0° to 100°. How many degrees does it turn?
25. 25.🦾 A servo moves from 140° to 80°. How many degrees does it turn?
26. 26.🦾 A servo moves from 90° to 50°. How many degrees does it turn?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
28. 28.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
29. 29.🦾 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 straight up (c) points right (d) points up and left
30. 30.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
31. 31.🦾 A servo program runs:
    angle = 170
    angle = angle − 50
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 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 up and left (d) points straight up
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
34. 34.🦾 A servo moves from 0° to 90°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 140
    angle = angle − 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
36. 36.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
37. 37.🦾 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 straight up (b) points right (c) points up and left (d) points up and right
38. 38.🦾 A servo moves from 130° to 50°. How many degrees does it turn?
39. 39.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
40. 40.🦾 A servo program runs:
    angle = 140
    angle = angle − 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?

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