Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 79 · 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 turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
2. 2.🦾 A servo moves from 50° to 80°. How many degrees does it turn?
3. 3.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
4. 4.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
5. 5.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
6. 6.🦾 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 left (c) points right (d) points up and right
7. 7.🦾 A servo program runs:
   angle = 30
   angle = angle + 40
   angle = angle − 20
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
8. 8.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
10. 10.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
12. 12.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
13. 13.🦾 A servo program runs:
    angle = 70
    angle = angle − 10
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 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 right (b) points up and left (c) points straight up (d) points left
15. 15.🦾 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 up and right (c) points left (d) points straight up
16. 16.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a servo motor (d) a buzzer
17. 17.🦾 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 straight up (b) points right (c) points left (d) points up and right
18. 18.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 180° (d) 10°
19. 19.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
21. 21.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
22. 22.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
23. 23.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
24. 24.🦾 A servo program runs:
    angle = 120
    angle = angle − 30
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
25. 25.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
26. 26.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
27. 27.🦾 A servo program runs:
    angle = 80
    angle = angle − 10
    angle = angle − 10
    angle = angle + 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
28. 28.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
29. 29.🦾 A servo moves from 90° to 40°. How many degrees does it turn?
30. 30.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a buzzer (d) a servo motor
31. 31.⚙️ 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
32. 32.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
33. 33.🦾 A servo program runs:
    angle = 100
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
34. 34.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
35. 35.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
36. 36.🦾 A servo moves from 120° to 0°. How many degrees does it turn?
37. 37.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
38. 38.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
39. 39.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False

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