Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 167 · 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 70° to 100°. How many degrees does it turn?
2. 2.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
3. 3.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
4. 4.🦾 A servo program runs:
   angle = 40
   angle = angle + 40
   angle = angle + 50
   angle = angle − 20
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
5. 5.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
6. 6.🦾 A servo program runs:
   angle = 150
   angle = angle − 50
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
7. 7.🦾 A servo moves from 100° to 30°. How many degrees does it turn?
8. 8.🦾 A servo moves from 20° to 140°. How many degrees does it turn?
9. 9.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
10. 10.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
11. 11.🦾 A servo program runs:
    angle = 80
    angle = angle − 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
12. 12.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
13. 13.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
14. 14.🦾 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 straight up (d) points up and right
15. 15.🦾 A servo moves from 50° to 180°. How many degrees does it turn?
16. 16.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
18. 18.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
19. 19.⚙️ 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
20. 20.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
21. 21.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
22. 22.🦾 A servo program runs:
    angle = 70
    angle = angle − 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 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 right (b) points right (c) points straight up (d) points left
24. 24.🦾 A servo moves from 100° to 90°. How many degrees does it turn?
25. 25.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
27. 27.🦾 A servo program runs:
    angle = 150
    angle = angle − 20
    angle = angle + 10
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
28. 28.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
29. 29.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
31. 31.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
32. 32.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
33. 33.🦾 A servo moves from 40° to 180°. How many degrees does it turn?
34. 34.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a light sensor (d) a servo motor
35. 35.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
36. 36.🦾 A servo program runs:
    angle = 100
    angle = angle + 50
    angle = angle − 30
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo moves from 50° to 150°. How many degrees does it turn?
38. 38.🦾 A servo moves from 0° to 30°. How many degrees does it turn?
39. 39.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
40. 40.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor

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