Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 175 · 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 120°?
2. 2.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
3. 3.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
4. 4.🦾 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 left (b) points left (c) points right (d) points up and right
5. 5.🦾 A servo moves from 90° to 60°. How many degrees does it turn?
6. 6.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
7. 7.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
8. 8.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
10. 10.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan
11. 11.🦾 A servo moves from 180° to 30°. How many degrees does it turn?
12. 12.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
13. 13.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
14. 14.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
15. 15.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
16. 16.🦾 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 right (b) points left (c) points up and right (d) points straight up
17. 17.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
18. 18.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
19. 19.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle − 30
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
21. 21.🦾 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 right (c) points up and left (d) points up and right
22. 22.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
23. 23.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
24. 24.🦾 A servo program runs:
    angle = 110
    angle = angle + 50
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo program runs:
    angle = 130
    angle = angle + 10
    angle = angle + 40
    angle = angle − 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo moves from 100° to 20°. How many degrees does it turn?
27. 27.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
28. 28.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle + 10
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo moves from 180° to 100°. How many degrees does it turn?
30. 30.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
31. 31.🦾 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 left (b) points up and right (c) points up and left (d) points right
32. 32.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
35. 35.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo moves from 30° to 80°. How many degrees does it turn?
37. 37.🦾 A servo moves from 170° to 0°. How many degrees does it turn?
38. 38.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle + 20
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
39. 39.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a DC motor (d) a servo motor
40. 40.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) paint it red (d) add more wheels

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