Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 184 · 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 motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light
2. 2.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
3. 3.🦾 A servo moves from 160° to 30°. How many degrees does it turn?
4. 4.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
5. 5.🦾 A servo program runs:
   angle = 10
   angle = angle + 40
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
6. 6.🦾 A servo program runs:
   angle = 170
   angle = angle − 50
   angle = angle + 60
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
7. 7.🦾 A servo moves from 80° to 100°. How many degrees does it turn?
8. 8.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
9. 9.🦾 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 left (d) points up and right
10. 10.⚙️ 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
11. 11.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
12. 12.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
13. 13.🦾 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 up and right (b) points up and left (c) points left (d) points right
14. 14.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
16. 16.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
18. 18.🦾 A servo program runs:
    angle = 150
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
19. 19.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
20. 20.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
21. 21.🦾 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 right (b) points up and left (c) points straight up (d) points up and right
22. 22.⚙️ 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
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
24. 24.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
25. 25.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
26. 26.🦾 A servo moves from 170° to 20°. How many degrees does it turn?
27. 27.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
28. 28.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 10° (d) 1800°
29. 29.🦾 A servo moves from 20° to 110°. How many degrees does it turn?
30. 30.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
32. 32.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) paint it red (d) shake it
33. 33.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
34. 34.🦾 A servo moves from 30° to 100°. How many degrees does it turn?
35. 35.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
36. 36.🦾 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 left (b) points up and right (c) points right (d) points straight up
37. 37.🦾 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 straight up (d) points up and left
38. 38.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
40. 40.🦾 A servo program runs:
    angle = 70
    angle = angle + 20
    angle = angle − 30
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?

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