Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 540 · 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 = 170
   angle = angle − 50
   angle = angle − 50
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
2. 2.🦾 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 right (c) points straight up (d) points left
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
4. 4.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
5. 5.🦾 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 up and right (d) points straight up
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
7. 7.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
8. 8.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) light (d) sound only
9. 9.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
10. 10.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
11. 11.🦾 A servo program runs:
    angle = 70
    angle = angle − 50
    angle = angle − 10
    angle = angle + 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
12. 12.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
13. 13.🦾 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 up and right (b) points right (c) points straight up (d) points left
14. 14.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
15. 15.🦾 A servo moves from 60° to 130°. How many degrees does it turn?
16. 16.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a buzzer (d) a fan
17. 17.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
18. 18.⚙️ 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
19. 19.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
20. 20.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
21. 21.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
22. 22.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
23. 23.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
24. 24.🦾 A servo moves from 80° to 110°. How many degrees does it turn?
25. 25.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
26. 26.🦾 A servo moves from 170° to 180°. How many degrees does it turn?
27. 27.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
28. 28.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
29. 29.🦾 A servo program runs:
    angle = 120
    angle = angle + 20
    angle = angle − 50
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
31. 31.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
32. 32.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo 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.🦾 A servo moves from 160° to 0°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 20
    angle = angle − 10
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
37. 37.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
38. 38.🦾 A servo moves from 180° to 20°. How many degrees does it turn?
39. 39.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
40. 40.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red

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