Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 674 · 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: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
2. 2.🦾 A servo moves from 70° to 80°. How many degrees does it turn?
3. 3.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
4. 4.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
5. 5.🦾 A servo program runs:
   angle = 70
   angle = angle − 10
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
6. 6.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
7. 7.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
8. 8.🦾 A servo moves from 100° to 20°. How many degrees does it turn?
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 turns to an exact angle? (a) a DC motor (b) a servo motor
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
12. 12.🦾 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 right (b) points left (c) points up and left (d) points right
13. 13.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
14. 14.🦾 A servo program runs:
    angle = 70
    angle = angle − 50
    angle = angle + 10
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
16. 16.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
17. 17.🦾 A servo program runs:
    angle = 130
    angle = angle + 40
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo moves from 30° to 60°. How many degrees does it turn?
19. 19.🦾 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 right (d) points up and right
20. 20.🦾 A servo moves from 80° to 150°. How many degrees does it turn?
21. 21.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
24. 24.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle − 50
    angle = angle + 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo moves from 60° to 140°. How many degrees does it turn?
26. 26.🦾 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 right (b) points up and right (c) points up and left (d) points left
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
28. 28.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
29. 29.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
30. 30.🦾 A servo moves from 130° to 20°. How many degrees does it turn?
31. 31.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
32. 32.🦾 A servo program runs:
    angle = 110
    angle = angle + 10
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
33. 33.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
34. 34.🦾 A servo moves from 170° to 160°. How many degrees does it turn?
35. 35.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
36. 36.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
37. 37.🦾 A servo moves from 20° to 90°. How many degrees does it turn?
38. 38.🦾 A servo moves from 90° to 100°. How many degrees does it turn?
39. 39.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
40. 40.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True

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