Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 206 · 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.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
2. 2.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
3. 3.🦾 A servo moves from 90° to 40°. How many degrees does it turn?
4. 4.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
5. 5.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
6. 6.🦾 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
7. 7.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) paint it red (d) swap its two wires
8. 8.🦾 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 left (b) points right (c) points up and left (d) points up and right
9. 9.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
10. 10.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
11. 11.🦾 A servo moves from 160° to 50°. How many degrees does it turn?
12. 12.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a servo motor (d) a buzzer
13. 13.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
14. 14.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
16. 16.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
17. 17.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
18. 18.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
19. 19.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
20. 20.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
21. 21.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
22. 22.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
23. 23.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
24. 24.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
25. 25.🦾 A servo moves from 70° to 120°. How many degrees does it turn?
26. 26.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
28. 28.🦾 A servo program runs:
    angle = 80
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo moves from 60° to 100°. How many degrees does it turn?
30. 30.🦾 A servo moves from 160° to 110°. How many degrees does it turn?
31. 31.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
32. 32.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
33. 33.🦾 A servo moves from 30° to 90°. How many degrees does it turn?
34. 34.🦾 A servo moves from 20° to 30°. How many degrees does it turn?
35. 35.🦾 A servo moves from 140° to 40°. How many degrees does it turn?
36. 36.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
37. 37.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
38. 38.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo program runs:
    angle = 30
    angle = angle − 30
    angle = angle + 30
    angle = angle + 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False

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