Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 942 · 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.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
2. 2.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
3. 3.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
4. 4.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
5. 5.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
7. 7.🦾 A servo program runs:
   angle = 20
   angle = angle + 40
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
8. 8.🦾 A servo program runs:
   angle = 70
   angle = angle − 40
   angle = angle + 60
   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 0°. Where does the arm point? (a) points up and right (b) points right (c) points left (d) points straight up
10. 10.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a DC motor (d) a servo motor
11. 11.🦾 A servo program runs:
    angle = 80
    angle = angle − 30
    angle = angle − 40
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
12. 12.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
13. 13.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
14. 14.🦾 A servo moves from 180° to 0°. How many degrees does it turn?
15. 15.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
16. 16.🦾 A servo moves from 40° to 70°. How many degrees does it turn?
17. 17.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
18. 18.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
19. 19.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
20. 20.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
21. 21.🦾 A servo moves from 80° to 140°. How many degrees does it turn?
22. 22.🦾 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 up and right (b) points left (c) points right (d) points up and left
23. 23.🦾 A servo moves from 170° to 50°. How many degrees does it turn?
24. 24.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
25. 25.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a buzzer (d) a light sensor
26. 26.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
28. 28.🦾 A servo program runs:
    angle = 120
    angle = angle − 10
    angle = angle + 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ 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
30. 30.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
31. 31.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
32. 32.🦾 A servo moves from 100° to 0°. How many degrees does it turn?
33. 33.🦾 A servo moves from 70° to 110°. How many degrees does it turn?
34. 34.🦾 A servo moves from 140° to 10°. How many degrees does it turn?
35. 35.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
36. 36.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
37. 37.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
38. 38.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
39. 39.🦾 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 left (b) points up and right (c) points right (d) points left
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?

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