Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 934 · 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.🦾 A servo program runs:
   angle = 150
   angle = angle − 40
   angle = angle − 10
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
2. 2.🦾 A servo moves from 50° to 110°. How many degrees does it turn?
3. 3.🦾 A servo program runs:
   angle = 50
   angle = angle + 60
   angle = angle − 40
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
4. 4.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) paint it red (d) swap its two wires
5. 5.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
6. 6.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) light (d) water
7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
8. 8.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
9. 9.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
10. 10.🦾 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 right (b) points straight up (c) points right (d) points left
11. 11.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
12. 12.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle + 40
    angle = angle − 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 40
    angle = angle + 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
14. 14.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
16. 16.🦾 A servo moves from 120° to 70°. How many degrees does it turn?
17. 17.🦾 A servo moves from 80° to 30°. How many degrees does it turn?
18. 18.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
20. 20.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
21. 21.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
22. 22.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
23. 23.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
25. 25.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
26. 26.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
27. 27.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
28. 28.🦾 A servo program runs:
    angle = 50
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
29. 29.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
30. 30.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
31. 31.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
32. 32.🦾 A servo program runs:
    angle = 150
    angle = angle − 20
    angle = angle + 30
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
33. 33.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
34. 34.🦾 A servo moves from 170° to 0°. How many degrees does it turn?
35. 35.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
37. 37.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
38. 38.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
39. 39.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
40. 40.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor

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