Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 193 · 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 usually turns 0° to 180°? (a) a DC motor (b) a servo motor
2. 2.🦾 A servo program runs:
   angle = 160
   angle = angle − 40
   angle = angle − 10
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
3. 3.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
4. 4.🦾 A servo moves from 20° to 130°. How many degrees does it turn?
5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
6. 6.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
7. 7.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
9. 9.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
10. 10.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
11. 11.🦾 A servo moves from 80° to 0°. How many degrees does it turn?
12. 12.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) paint it red (d) add more wheels
13. 13.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
15. 15.🦾 A servo program runs:
    angle = 140
    angle = angle + 30
    angle = angle − 50
    angle = angle + 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo moves from 150° to 180°. How many degrees does it turn?
17. 17.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 1800° (d) 10°
18. 18.🦾 A servo program runs:
    angle = 140
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
19. 19.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
20. 20.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
21. 21.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water
22. 22.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
23. 23.🦾 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 straight up (b) points left (c) points up and left (d) points up and right
24. 24.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
25. 25.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
26. 26.🦾 A servo program runs:
    angle = 80
    angle = angle − 60
    angle = angle + 20
    angle = angle + 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle − 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo moves from 160° to 50°. How many degrees does it turn?
29. 29.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor
30. 30.🦾 A servo program runs:
    angle = 90
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle + 50
    angle = angle − 10
    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 135°. Where does the arm point? (a) points right (b) points up and left (c) points up and right (d) points left
33. 33.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle − 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
34. 34.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
36. 36.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
37. 37.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle − 40
    angle = angle + 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 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 up and right (c) points straight up (d) points right
39. 39.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
40. 40.🦾 A servo moves from 150° to 160°. How many degrees does it turn?

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