Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 315 · 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.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a buzzer (d) a servo motor
2. 2.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
3. 3.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
4. 4.⚙️ 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
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
6. 6.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
8. 8.🦾 A servo program runs:
   angle = 10
   angle = angle + 50
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
9. 9.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
10. 10.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
11. 11.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
12. 12.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
13. 13.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
14. 14.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
15. 15.🦾 A servo program runs:
    angle = 120
    angle = angle − 10
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 A servo program runs:
    angle = 160
    angle = angle − 60
    angle = angle − 40
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
18. 18.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
19. 19.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
20. 20.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
21. 21.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle − 50
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo moves from 30° to 0°. How many degrees does it turn?
23. 23.🦾 A servo program runs:
    angle = 150
    angle = angle + 10
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo moves from 50° to 170°. How many degrees does it turn?
25. 25.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
26. 26.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
27. 27.🦾 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 left (c) points right (d) points up and right
28. 28.🦾 A servo moves from 50° to 150°. How many degrees does it turn?
29. 29.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
30. 30.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
31. 31.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
32. 32.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
33. 33.🦾 A servo moves from 90° to 180°. How many degrees does it turn?
34. 34.🦾 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 right (b) points straight up (c) points right (d) points up and left
35. 35.⚙️ DC motor or servo motor: which one has a signal wire? (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 turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
38. 38.🦾 A servo moves from 100° to 80°. How many degrees does it turn?
39. 39.🦾 A servo program runs:
    angle = 80
    angle = angle − 60
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo program runs:
    angle = 100
    angle = angle − 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?

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