Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 318 · 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: “has just two wires” is true of a servo motor. (a) False (b) True
2. 2.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red
3. 3.🦾 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 right (b) points straight up (c) points up and left (d) points left
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
5. 5.⚙️ 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
6. 6.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
7. 7.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
8. 8.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
9. 9.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
10. 10.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
11. 11.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
12. 12.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle + 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 A servo moves from 160° to 70°. How many degrees does it turn?
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 up and left (b) points straight up (c) points up and right (d) points left
15. 15.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 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 straight up (c) points right (d) points up and left
17. 17.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
18. 18.🦾 A servo moves from 90° to 70°. How many degrees does it turn?
19. 19.🦾 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 right (b) points up and left (c) points right (d) points left
20. 20.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
21. 21.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
22. 22.🦾 A servo moves from 100° to 130°. How many degrees does it turn?
23. 23.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
24. 24.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
25. 25.🦾 A servo moves from 130° to 110°. How many degrees does it turn?
26. 26.🦾 A servo moves from 150° to 130°. How many degrees does it turn?
27. 27.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo program runs:
    angle = 170
    angle = angle − 50
    angle = angle − 30
    angle = angle + 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo moves from 120° to 100°. How many degrees does it turn?
30. 30.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
31. 31.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo moves from 150° to 140°. How many degrees does it turn?
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
34. 34.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
35. 35.🦾 A servo program runs:
    angle = 120
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
36. 36.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
37. 37.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
38. 38.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
39. 39.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
40. 40.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor

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