Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 423 · 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: “holds a set angle” is true of a servo motor. (a) False (b) True
2. 2.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
3. 3.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a DC motor (d) a servo motor
4. 4.🦾 A servo program runs:
   angle = 30
   angle = angle + 50
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
5. 5.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
6. 6.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
7. 7.🦾 A servo program runs:
   angle = 10
   angle = angle + 40
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
8. 8.🦾 A servo program runs:
   angle = 30
   angle = angle + 50
   angle = angle − 50
   angle = angle + 30
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
9. 9.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
10. 10.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
11. 11.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
12. 12.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) shake it (d) paint it red
13. 13.🦾 A servo moves from 70° to 50°. How many degrees does it turn?
14. 14.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
15. 15.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a DC motor (d) a buzzer
16. 16.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
17. 17.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
18. 18.🦾 A servo program runs:
    angle = 160
    angle = angle + 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle − 60
    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 0°. Where does the arm point? (a) points right (b) points straight up (c) points up and left (d) points left
21. 21.🦾 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 up and right (d) points right
22. 22.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
23. 23.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
24. 24.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
25. 25.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
27. 27.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
28. 28.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
29. 29.🦾 A servo moves from 10° to 70°. How many degrees does it turn?
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
31. 31.🦾 A servo program runs:
    angle = 130
    angle = angle + 10
    angle = angle − 10
    angle = angle + 10
    angle = angle + 20
    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: “spins faster with more V” is true of a servo motor. (a) True (b) False
34. 34.🦾 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 left (b) points up and left (c) points straight up (d) points right
35. 35.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
36. 36.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
37. 37.🦾 A servo moves from 80° to 40°. How many degrees does it turn?
38. 38.🦾 A servo moves from 70° to 100°. How many degrees does it turn?
39. 39.🦾 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 right (b) points up and right (c) points up and left (d) points straight up
40. 40.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°

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