Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 117 · 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 20° to 160°. How many degrees does it turn?
2. 2.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
3. 3.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) shake it (d) paint it red
4. 4.🦾 A servo program runs:
   angle = 20
   angle = angle + 30
   angle = angle + 20
   angle = angle + 10
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
5. 5.🦾 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 up and right (c) points up and left (d) points straight up
6. 6.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
7. 7.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
8. 8.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
9. 9.⚙️ 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
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
11. 11.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
12. 12.🦾 A servo program runs:
    angle = 170
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle + 60
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 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 right (c) points up and left (d) points left
15. 15.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
16. 16.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle + 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
17. 17.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
18. 18.🦾 A servo moves from 100° to 120°. How many degrees does it turn?
19. 19.🦾 A servo moves from 40° to 0°. How many degrees does it turn?
20. 20.🦾 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 straight up (b) points up and right (c) points left (d) points right
21. 21.🦾 A servo moves from 30° to 110°. How many degrees does it turn?
22. 22.🦾 A servo moves from 50° to 150°. How many degrees does it turn?
23. 23.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
24. 24.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
25. 25.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
26. 26.🦾 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 right (c) points left (d) points up and right
27. 27.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
28. 28.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
29. 29.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
30. 30.⚙️ 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
31. 31.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
32. 32.🦾 A servo moves from 50° to 180°. How many degrees does it turn?
33. 33.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
34. 34.🦾 A servo moves from 170° to 160°. How many degrees does it turn?
35. 35.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
36. 36.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
37. 37.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
39. 39.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?

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