Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 593 · 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 moves from 160° to 40°. How many degrees does it turn?
2. 2.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a fan (d) a DC motor
3. 3.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
4. 4.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
5. 5.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
8. 8.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points up and left (b) points straight up (c) points left (d) points right
9. 9.🦾 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 up and left (b) points right (c) points left (d) points straight up
10. 10.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
11. 11.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a buzzer (d) a servo motor
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
13. 13.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
14. 14.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water
15. 15.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
16. 16.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 50
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
18. 18.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
19. 19.⚙️ 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
20. 20.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
21. 21.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
22. 22.🦾 A servo program runs:
    angle = 50
    angle = angle + 20
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
23. 23.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
24. 24.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
26. 26.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
27. 27.🦾 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
28. 28.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
29. 29.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
30. 30.🦾 A servo program runs:
    angle = 90
    angle = angle + 30
    angle = angle + 10
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
32. 32.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
33. 33.🦾 A servo moves from 120° to 160°. 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 135°. Where does the arm point? (a) points left (b) points up and left (c) points right (d) points up and right
35. 35.🦾 A servo program runs:
    angle = 110
    angle = angle − 40
    angle = angle − 20
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 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
37. 37.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
38. 38.🦾 A servo moves from 170° to 50°. How many degrees does it turn?
39. 39.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
40. 40.🦾 A servo moves from 50° to 90°. How many degrees does it turn?

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