Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 808 · 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.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
2. 2.🦾 A servo program runs:
   angle = 180
   angle = angle − 60
   angle = angle − 10
   angle = angle − 40
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
3. 3.🦾 A servo program runs:
   angle = 110
   angle = angle − 20
   angle = angle − 20
   angle = angle + 40
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
4. 4.🦾 A servo moves from 130° to 50°. How many degrees does it turn?
5. 5.🦾 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 left (b) points up and right (c) points right (d) points up and left
6. 6.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
8. 8.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
9. 9.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
10. 10.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
11. 11.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
12. 12.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
13. 13.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
14. 14.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
15. 15.🦾 A servo program runs:
    angle = 110
    angle = angle + 50
    angle = angle − 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
16. 16.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
18. 18.🦾 A servo moves from 70° to 10°. How many degrees does it turn?
19. 19.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
20. 20.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a servo motor (d) a light sensor
21. 21.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
22. 22.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
24. 24.🦾 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 left (b) points right (c) points straight up (d) points up and right
25. 25.🦾 A servo moves from 140° to 20°. How many degrees does it turn?
26. 26.🦾 A servo moves from 120° to 160°. How many degrees does it turn?
27. 27.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
28. 28.🦾 A servo program runs:
    angle = 170
    angle = angle − 50
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
30. 30.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
31. 31.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
32. 32.🦾 A servo moves from 90° to 20°. How many degrees does it turn?
33. 33.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
34. 34.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
35. 35.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
36. 36.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
37. 37.🦾 A servo program runs:
    angle = 40
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 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 up and left (b) points right (c) points straight up (d) points up and right
39. 39.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
40. 40.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True

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