Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 621 · 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: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
2. 2.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
5. 5.🦾 A servo moves from 10° to 70°. How many degrees does it turn?
6. 6.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
7. 7.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
8. 8.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
10. 10.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a DC motor (d) a servo motor
11. 11.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
12. 12.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
14. 14.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
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 up and left
16. 16.🦾 A servo moves from 110° to 0°. How many degrees does it turn?
17. 17.🦾 A servo program runs:
    angle = 120
    angle = angle + 10
    angle = angle − 60
    angle = angle + 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo program runs:
    angle = 10
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle + 20
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 A servo program runs:
    angle = 160
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
21. 21.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
22. 22.🦾 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 left (d) points up and right
23. 23.🦾 A servo moves from 20° to 30°. How many degrees does it turn?
24. 24.🦾 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 straight up (b) points left (c) points right (d) points up and right
25. 25.🦾 A servo program runs:
    angle = 160
    angle = angle − 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
26. 26.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) swap its two wires (d) add more wheels
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
28. 28.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
29. 29.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
30. 30.🦾 A servo moves from 120° to 60°. How many degrees does it turn?
31. 31.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
32. 32.🦾 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 up and left (b) points straight up (c) points left (d) points right
33. 33.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo program runs:
    angle = 60
    angle = angle − 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
35. 35.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
36. 36.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
37. 37.🦾 A servo moves from 110° to 40°. How many degrees does it turn?
38. 38.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle − 60
    angle = angle − 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
39. 39.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
40. 40.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True

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