Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 114 · 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: “moves an arm joint” is true of a DC motor. (a) True (b) False
2. 2.🦾 A servo moves from 0° to 10°. How many degrees does it turn?
3. 3.🦾 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 right (b) points left (c) points up and left (d) points up and right
4. 4.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
5. 5.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
7. 7.🦾 A servo moves from 110° to 0°. How many degrees does it turn?
8. 8.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a DC motor (d) a buzzer
9. 9.🦾 A servo moves from 110° to 70°. How many degrees does it turn?
10. 10.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
11. 11.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
12. 12.🦾 A servo program runs:
    angle = 50
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
13. 13.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a servo motor (d) a DC motor
14. 14.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
15. 15.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) add more wheels (d) shake it
16. 16.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
17. 17.🦾 A servo moves from 80° to 50°. How many degrees does it turn?
18. 18.🦾 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 straight up (c) points up and right (d) points up and left
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
20. 20.🦾 A servo program runs:
    angle = 160
    angle = angle + 10
    angle = angle − 10
    angle = angle − 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
21. 21.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
22. 22.🦾 A servo moves from 0° to 40°. How many degrees does it turn?
23. 23.🦾 A servo program runs:
    angle = 20
    angle = angle − 10
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
25. 25.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 18° (d) 1800°
26. 26.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
27. 27.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
28. 28.🦾 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 right (c) points straight up (d) points up and right
29. 29.🦾 A servo moves from 30° to 20°. How many degrees does it turn?
30. 30.🦾 A servo moves from 130° to 20°. How many degrees does it turn?
31. 31.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
32. 32.🦾 A servo program runs:
    angle = 110
    angle = angle − 40
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo moves from 130° to 170°. How many degrees does it turn?
34. 34.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
35. 35.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
36. 36.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
37. 37.🦾 A servo moves from 70° to 0°. How many degrees does it turn?
38. 38.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
39. 39.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
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