Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 803 · 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 turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
2. 2.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
3. 3.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
5. 5.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
6. 6.🦾 A servo program runs:
   angle = 70
   angle = angle + 20
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
7. 7.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
8. 8.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
10. 10.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
11. 11.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
12. 12.🦾 A servo moves from 40° to 110°. How many degrees does it turn?
13. 13.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
14. 14.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
15. 15.🦾 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 right (c) points right (d) points up and left
16. 16.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
17. 17.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
18. 18.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle − 30
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
19. 19.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
20. 20.🦾 A servo program runs:
    angle = 150
    angle = angle − 20
    angle = angle − 50
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
21. 21.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a servo motor (d) a buzzer
22. 22.🦾 A servo program runs:
    angle = 80
    angle = angle + 50
    angle = angle + 30
    angle = angle − 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo moves from 140° to 0°. How many degrees does it turn?
24. 24.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 10° (d) 18°
25. 25.⚙️ 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
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
27. 27.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
28. 28.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
29. 29.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a servo motor (d) a buzzer
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
31. 31.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
32. 32.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
33. 33.🦾 A servo moves from 30° to 170°. How many degrees does it turn?
34. 34.🦾 A servo moves from 80° to 40°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 170
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
38. 38.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
39. 39.🦾 A servo program runs:
    angle = 60
    angle = angle − 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True

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