Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 965 · 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: “spins round and round” is true of a DC motor. (a) True (b) False
2. 2.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
3. 3.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 18° (d) 10°
4. 4.🦾 A servo program runs:
   angle = 150
   angle = angle + 30
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
5. 5.🦾 A servo program runs:
   angle = 90
   angle = angle − 20
   angle = angle − 30
   angle = angle + 50
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
6. 6.🦾 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 right (d) points left
7. 7.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
8. 8.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) paint it red (d) shake it
9. 9.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
10. 10.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
11. 11.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
12. 12.🦾 A servo program runs:
    angle = 80
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
13. 13.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
14. 14.🦾 A servo moves from 140° to 20°. How many degrees does it turn?
15. 15.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
17. 17.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
18. 18.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a buzzer (d) a servo motor
19. 19.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
20. 20.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
21. 21.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 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 left (b) points right (c) points straight up (d) points up and right
23. 23.🦾 A servo moves from 80° to 40°. How many degrees does it turn?
24. 24.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
26. 26.🦾 A servo moves from 90° to 120°. How many degrees does it turn?
27. 27.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
28. 28.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
29. 29.🦾 A servo moves from 0° to 130°. How many degrees does it turn?
30. 30.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
31. 31.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
32. 32.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
35. 35.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
36. 36.🦾 A servo program runs:
    angle = 180
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
37. 37.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
38. 38.🦾 A servo moves from 30° to 20°. How many degrees does it turn?
39. 39.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
40. 40.🦾 A servo moves from 80° to 50°. How many degrees does it turn?

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