Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 805 · 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 moves from 80° to 140°. How many degrees does it turn?
2. 2.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a DC motor (d) a fan
3. 3.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
4. 4.🦾 A servo moves from 90° to 80°. How many degrees does it turn?
5. 5.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a DC motor (d) a light sensor
6. 6.🦾 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
7. 7.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
8. 8.🦾 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 straight up (c) points left (d) points up and right
9. 9.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
10. 10.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 180° (d) 18°
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
12. 12.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
13. 13.🦾 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 left (c) points straight up (d) points right
14. 14.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
15. 15.🦾 A servo moves from 170° to 160°. How many degrees does it turn?
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
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 left (b) points up and right (c) points up and left (d) points right
18. 18.🦾 A servo moves from 60° to 180°. How many degrees does it turn?
19. 19.🦾 A servo program runs:
    angle = 20
    angle = angle + 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
20. 20.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
21. 21.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
22. 22.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
24. 24.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
25. 25.🦾 A servo moves from 10° to 40°. How many degrees does it turn?
26. 26.🦾 A servo moves from 110° to 0°. How many degrees does it turn?
27. 27.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
28. 28.🦾 A servo moves from 140° to 20°. How many degrees does it turn?
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
30. 30.🦾 A servo moves from 30° to 40°. How many degrees does it turn?
31. 31.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
33. 33.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
34. 34.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
35. 35.True or false: “has just two wires” 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 program runs:
    angle = 110
    angle = angle − 10
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo program runs:
    angle = 40
    angle = angle − 20
    angle = angle + 40
    angle = angle − 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
39. 39.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
40. 40.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True

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