Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 44 · 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: “has a signal wire” is true of a servo motor. (a) True (b) False
2. 2.🦾 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 right (b) points left (c) points up and right (d) points up and left
3. 3.🦾 A servo program runs:
   angle = 140
   angle = angle − 10
   angle = angle − 50
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
5. 5.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
6. 6.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
7. 7.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
8. 8.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
9. 9.🦾 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 left (c) points up and left (d) points up and right
10. 10.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a DC motor (d) a servo motor
11. 11.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
12. 12.⚙️ DC motor or servo motor: which one has a signal wire? (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 0°. Where does the arm point? (a) points up and right (b) points up and left (c) points right (d) points left
14. 14.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
15. 15.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
16. 16.🦾 A servo moves from 120° to 0°. How many degrees does it turn?
17. 17.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
18. 18.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
19. 19.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
20. 20.🦾 A servo moves from 0° to 160°. How many degrees does it turn?
21. 21.🦾 A servo moves from 120° to 100°. How many degrees does it turn?
22. 22.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
23. 23.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
24. 24.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
25. 25.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
27. 27.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
28. 28.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
29. 29.⚙️ 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
30. 30.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
31. 31.🦾 A servo moves from 20° to 180°. How many degrees does it turn?
32. 32.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 110
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
34. 34.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
35. 35.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
36. 36.🦾 A servo program runs:
    angle = 80
    angle = angle + 50
    angle = angle − 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo moves from 20° to 110°. How many degrees does it turn?
38. 38.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo moves from 30° to 90°. How many degrees does it turn?
40. 40.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor

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