Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 592 · 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 moves from 150° to 20°. How many degrees does it turn?
2. 2.⚙️ 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
3. 3.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
4. 4.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 18° (d) 10°
5. 5.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
6. 6.🦾 A servo program runs:
   angle = 70
   angle = angle − 60
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
7. 7.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
8. 8.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
9. 9.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
10. 10.🦾 A servo program runs:
    angle = 70
    angle = angle − 10
    angle = angle − 50
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
11. 11.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
12. 12.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a buzzer (d) a light sensor
13. 13.🦾 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 left (b) points straight up (c) points up and right (d) points right
14. 14.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
15. 15.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
16. 16.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
17. 17.🦾 A servo moves from 10° to 120°. How many degrees does it turn?
18. 18.🦾 A servo moves from 180° to 100°. How many degrees does it turn?
19. 19.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle + 20
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 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 up and right (c) points right (d) points straight up
21. 21.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
23. 23.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
24. 24.🦾 A servo program runs:
    angle = 60
    angle = angle − 20
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
27. 27.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
28. 28.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
29. 29.🦾 A servo moves from 100° to 70°. How many degrees does it turn?
30. 30.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
31. 31.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
32. 32.🦾 A servo moves from 180° to 30°. How many degrees does it turn?
33. 33.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
35. 35.🦾 A servo moves from 70° to 60°. How many degrees does it turn?
36. 36.🦾 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 up and left (b) points right (c) points straight up (d) points up and right
37. 37.🦾 A servo moves from 30° to 130°. How many degrees does it turn?
38. 38.🦾 A servo moves from 160° to 10°. How many degrees does it turn?
39. 39.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
40. 40.🦾 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 up and left (c) points left (d) points straight up

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