Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 641 · 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.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
2. 2.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
3. 3.🦾 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 straight up (c) points up and right (d) points left
4. 4.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
5. 5.🦾 A servo program runs:
   angle = 50
   angle = angle + 60
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
6. 6.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
7. 7.🦾 A servo program runs:
   angle = 40
   angle = angle + 40
   angle = angle + 20
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
8. 8.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
9. 9.🦾 A servo moves from 130° to 150°. How many degrees does it turn?
10. 10.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
11. 11.🦾 A servo moves from 160° to 90°. How many degrees does it turn?
12. 12.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) shake it (d) swap its two wires
13. 13.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) light (d) movement
14. 14.🦾 A servo program runs:
    angle = 70
    angle = angle + 40
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
15. 15.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
17. 17.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo moves from 90° to 120°. How many degrees does it turn?
19. 19.🦾 A servo moves from 80° to 130°. How many degrees does it turn?
20. 20.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
21. 21.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
22. 22.🦾 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 right (c) points up and left (d) points straight up
23. 23.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
24. 24.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
25. 25.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
26. 26.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
27. 27.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
28. 28.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
30. 30.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
31. 31.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
32. 32.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
33. 33.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
34. 34.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
35. 35.🦾 A servo moves from 180° to 70°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 130
    angle = angle + 20
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
37. 37.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo program runs:
    angle = 100
    angle = angle − 40
    angle = angle − 40
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
40. 40.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor

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