Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 818 · 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.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
3. 3.⚙️ A motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
4. 4.🦾 A servo moves from 130° to 70°. How many degrees does it turn?
5. 5.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
6. 6.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
7. 7.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
8. 8.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
9. 9.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
10. 10.🦾 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 up and right (c) points right (d) points up and left
11. 11.🦾 A servo moves from 20° to 10°. How many degrees does it turn?
12. 12.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
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 right (b) points straight up (c) points up and right (d) points left
14. 14.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
15. 15.🦾 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 up and right (c) points straight up (d) points up and left
16. 16.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
17. 17.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
18. 18.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a fan (d) a servo motor
19. 19.⚙️ 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
20. 20.🦾 A servo program runs:
    angle = 90
    angle = angle − 60
    angle = angle + 10
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo moves from 130° to 90°. How many degrees does it turn?
22. 22.🦾 A servo moves from 30° to 50°. How many degrees does it turn?
23. 23.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
26. 26.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
27. 27.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
28. 28.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
29. 29.🦾 A servo moves from 120° to 140°. 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 program runs:
    angle = 110
    angle = angle + 30
    angle = angle − 40
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
32. 32.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
33. 33.🦾 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 straight up (b) points left (c) points up and right (d) points right
34. 34.🦾 A servo program runs:
    angle = 30
    angle = angle − 30
    angle = angle + 30
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
35. 35.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
36. 36.🦾 A servo moves from 90° to 150°. How many degrees does it turn?
37. 37.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) paint it red (d) shake it
38. 38.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
39. 39.🦾 A servo moves from 150° to 160°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 140
    angle = angle + 40
    angle = angle − 10
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?

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