Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 342 · 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 = 100
   angle = angle − 60
   angle = angle + 40
   angle = angle + 20
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
3. 3.🦾 A servo program runs:
   angle = 0
   angle = angle + 20
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
4. 4.🦾 A servo moves from 170° to 110°. How many degrees does it turn?
5. 5.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
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 reverses if wires swap? (a) a servo motor (b) a DC motor
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
9. 9.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
10. 10.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
11. 11.🦾 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 right (b) points left (c) points up and left (d) points up and right
12. 12.🦾 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 left (b) points straight up (c) points up and left (d) points right
13. 13.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
14. 14.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
15. 15.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
16. 16.🦾 A servo program runs:
    angle = 140
    angle = angle + 20
    angle = angle − 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a light sensor (d) a buzzer
18. 18.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a DC motor (d) a fan
19. 19.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
20. 20.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
21. 21.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) sound only (d) water
22. 22.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
24. 24.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
25. 25.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
26. 26.🦾 A servo moves from 160° to 170°. How many degrees does it turn?
27. 27.🦾 A servo program runs:
    angle = 20
    angle = angle + 20
    angle = angle − 10
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
28. 28.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 180° (d) 1800°
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
30. 30.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
31. 31.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
32. 32.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
34. 34.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
35. 35.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) shake it (d) add more wheels
36. 36.🦾 A servo moves from 40° to 20°. How many degrees does it turn?
37. 37.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo moves from 40° to 80°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 120
    angle = angle − 30
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?

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