Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 625 · 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 program runs:
   angle = 60
   angle = angle − 10
   angle = angle + 60
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
2. 2.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
3. 3.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
4. 4.🦾 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 right (c) points up and right (d) points up and left
5. 5.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
6. 6.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
7. 7.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
8. 8.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
9. 9.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
10. 10.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
11. 11.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
12. 12.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
13. 13.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
14. 14.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
15. 15.🦾 A servo moves from 40° to 180°. How many degrees does it turn?
16. 16.🦾 A servo program runs:
    angle = 30
    angle = angle − 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
17. 17.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
18. 18.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
19. 19.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
20. 20.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
21. 21.🦾 A servo program runs:
    angle = 80
    angle = angle − 50
    angle = angle + 40
    angle = angle + 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
22. 22.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
23. 23.🦾 A servo moves from 180° to 100°. How many degrees does it turn?
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
25. 25.🦾 A servo moves from 30° to 40°. How many degrees does it turn?
26. 26.🦾 A servo moves from 80° to 40°. How many degrees does it turn?
27. 27.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 10° (d) 18°
28. 28.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
29. 29.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
31. 31.🦾 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 up and right (b) points up and left (c) points straight up (d) points right
32. 32.🦾 A servo program runs:
    angle = 60
    angle = angle − 60
    angle = angle + 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
33. 33.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a servo motor (d) a DC motor
34. 34.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
35. 35.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
37. 37.🦾 A servo program runs:
    angle = 150
    angle = angle − 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo moves from 0° to 160°. How many degrees does it turn?
39. 39.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?

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