Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 638 · 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.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
2. 2.🦾 A servo program runs:
   angle = 50
   angle = angle − 30
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
4. 4.🦾 A servo moves from 100° to 40°. How many degrees does it turn?
5. 5.⚙️ 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
6. 6.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
7. 7.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
8. 8.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
9. 9.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
10. 10.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 20
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
11. 11.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
12. 12.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
13. 13.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
15. 15.🦾 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 right (b) points straight up (c) points up and right (d) points left
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
17. 17.🦾 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 straight up (d) points right
18. 18.🦾 A servo moves from 90° to 150°. How many degrees does it turn?
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
20. 20.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) paint it red (d) add more wheels
21. 21.🦾 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 right (b) points left (c) points up and right (d) points up and left
22. 22.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
23. 23.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
24. 24.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
25. 25.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
26. 26.🦾 A servo moves from 70° to 180°. How many degrees does it turn?
27. 27.🦾 A servo moves from 60° to 170°. How many degrees does it turn?
28. 28.🦾 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 right (c) points straight up (d) points up and left
29. 29.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
30. 30.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
31. 31.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
32. 32.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
33. 33.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
34. 34.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
35. 35.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water
36. 36.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
38. 38.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
39. 39.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
40. 40.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True

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