Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 371 · 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.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
2. 2.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
3. 3.⚙️ 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
4. 4.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
5. 5.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 180° (d) 18°
6. 6.🦾 A servo moves from 30° to 20°. How many degrees does it turn?
7. 7.🦾 A servo program runs:
   angle = 100
   angle = angle − 30
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
8. 8.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
9. 9.🦾 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 straight up (d) points right
10. 10.🦾 A servo program runs:
    angle = 100
    angle = angle − 10
    angle = angle − 20
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
11. 11.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
12. 12.🦾 A servo moves from 80° to 160°. How many degrees does it turn?
13. 13.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
14. 14.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
15. 15.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
16. 16.🦾 A servo program runs:
    angle = 70
    angle = angle + 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
18. 18.🦾 A servo moves from 130° to 0°. How many degrees does it turn?
19. 19.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
20. 20.🦾 A servo moves from 150° to 100°. How many degrees does it turn?
21. 21.🦾 A servo program runs:
    angle = 80
    angle = angle − 60
    angle = angle + 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
22. 22.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
23. 23.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
24. 24.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
25. 25.🦾 A servo moves from 50° to 30°. How many degrees does it turn?
26. 26.🦾 A servo moves from 170° to 140°. How many degrees does it turn?
27. 27.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a DC motor (d) a servo motor
28. 28.🦾 A servo moves from 130° to 50°. How many degrees does it turn?
29. 29.🦾 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 right (b) points left (c) points right (d) points straight up
30. 30.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
31. 31.🦾 A servo program runs:
    angle = 130
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
33. 33.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
34. 34.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
35. 35.🦾 A servo program runs:
    angle = 110
    angle = angle − 50
    angle = angle + 10
    angle = angle + 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
37. 37.⚙️ 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
38. 38.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo program runs:
    angle = 180
    angle = angle − 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True

Free robotics lessons, practice and worksheets at talentjr.in/robotics-for-kids