Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 623 · 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 100° to 60°. How many degrees does it turn?
2. 2.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
3. 3.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
4. 4.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
6. 6.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
7. 7.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) swap its two wires (d) shake it
8. 8.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
9. 9.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
10. 10.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
11. 11.🦾 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 left (b) points right (c) points up and left (d) points up and right
12. 12.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
13. 13.🦾 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 right (b) points left (c) points up and right (d) points up and left
14. 14.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
15. 15.🦾 A servo moves from 50° to 30°. How many degrees does it turn?
16. 16.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
17. 17.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
18. 18.🦾 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 straight up (b) points up and left (c) points right (d) points left
19. 19.🦾 A servo moves from 10° to 130°. How many degrees does it turn?
20. 20.🦾 A servo moves from 150° to 160°. How many degrees does it turn?
21. 21.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
22. 22.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
23. 23.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
24. 24.🦾 A servo moves from 160° to 70°. How many degrees does it turn?
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
26. 26.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
27. 27.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
29. 29.🦾 A servo program runs:
    angle = 130
    angle = angle − 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo program runs:
    angle = 140
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
31. 31.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
32. 32.🦾 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 straight up (b) points left (c) points right (d) points up and right
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
34. 34.🦾 A servo moves from 0° to 40°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 140
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
36. 36.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
37. 37.🦾 A servo program runs:
    angle = 150
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo moves from 180° to 80°. How many degrees does it turn?
39. 39.🦾 A servo moves from 30° to 20°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 70
    angle = angle + 10
    angle = angle + 10
    angle = angle + 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?

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