Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 535 · 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 reverses if wires swap? (a) a servo motor (b) a DC motor
2. 2.🦾 A servo program runs:
   angle = 170
   angle = angle − 10
   angle = angle − 20
   angle = angle − 50
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
3. 3.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
4. 4.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
5. 5.🦾 A servo program runs:
   angle = 170
   angle = angle − 60
   angle = angle + 40
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
7. 7.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 1800° (d) 18°
8. 8.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
9. 9.🦾 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 up and left (c) points left (d) points straight up
10. 10.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle + 60
    angle = angle − 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
11. 11.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
12. 12.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
13. 13.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
14. 14.🦾 A servo moves from 0° to 90°. How many degrees does it turn?
15. 15.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
16. 16.🦾 A servo program runs:
    angle = 30
    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 moves an arm joint? (a) a DC motor (b) a servo motor
18. 18.🦾 A servo program runs:
    angle = 180
    angle = angle − 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
19. 19.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
20. 20.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
21. 21.🦾 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 up and right (d) points up and left
22. 22.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
23. 23.🦾 A servo moves from 100° to 150°. How many degrees does it turn?
24. 24.⚙️ A motor changes electrical energy into … (a) light (b) water (c) movement (d) sound only
25. 25.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
26. 26.🦾 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 straight up (b) points up and left (c) points right (d) points up and right
27. 27.🦾 A servo moves from 150° to 70°. How many degrees does it turn?
28. 28.🦾 A servo program runs:
    angle = 130
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ 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
30. 30.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a fan (d) a servo motor
31. 31.🦾 A servo moves from 180° to 60°. How many degrees does it turn?
32. 32.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
33. 33.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
34. 34.🦾 A servo moves from 10° to 130°. How many degrees does it turn?
35. 35.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a DC motor (d) a servo motor
36. 36.🦾 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 up and left (c) points right (d) points straight up
37. 37.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
38. 38.🦾 A servo moves from 80° to 90°. How many degrees does it turn?
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
40. 40.True or false: “has just two wires” is true of a DC motor. (a) True (b) False

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