Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 565 · 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 moves an arm joint? (a) a servo motor (b) a DC motor
2. 2.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
3. 3.🦾 A servo moves from 20° to 50°. How many degrees does it turn?
4. 4.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
5. 5.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
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 straight up (b) points up and left (c) points right (d) points up and right
7. 7.🦾 A servo program runs:
   angle = 100
   angle = angle − 20
   angle = angle − 60
   angle = angle + 50
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
8. 8.🦾 A servo program runs:
   angle = 160
   angle = angle − 40
   angle = angle − 10
   angle = angle + 60
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
9. 9.🦾 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 right (b) points left (c) points up and left (d) points straight up
10. 10.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water
11. 11.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
12. 12.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
13. 13.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
14. 14.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
15. 15.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
16. 16.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a light sensor (d) a buzzer
17. 17.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
18. 18.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
19. 19.🦾 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 straight up (c) points up and right (d) points right
20. 20.🦾 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 up and left (d) points right
21. 21.🦾 A servo moves from 180° to 60°. How many degrees does it turn?
22. 22.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
23. 23.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°
24. 24.🦾 A servo program runs:
    angle = 50
    angle = angle + 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
26. 26.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle + 40
    angle = angle + 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
27. 27.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
28. 28.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
29. 29.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
30. 30.🦾 A servo moves from 90° to 140°. How many degrees does it turn?
31. 31.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
32. 32.🦾 A servo moves from 10° to 170°. How many degrees does it turn?
33. 33.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
34. 34.🦾 A servo moves from 110° to 100°. How many degrees does it turn?
35. 35.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
37. 37.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
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: “moves an arm joint” is true of a DC motor. (a) True (b) False

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