Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 995 · 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 spins round and round? (a) a servo motor (b) a DC motor
2. 2.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
3. 3.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
4. 4.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
6. 6.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
7. 7.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
8. 8.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
9. 9.🦾 A servo program runs:
   angle = 30
   angle = angle − 10
   angle = angle + 60
   angle = angle + 10
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
10. 10.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
11. 11.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a light sensor (d) a servo motor
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
13. 13.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
14. 14.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
15. 15.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
16. 16.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
18. 18.🦾 A servo moves from 0° to 30°. How many degrees does it turn?
19. 19.🦾 A servo moves from 0° to 80°. How many degrees does it turn?
20. 20.🦾 A servo moves from 50° to 60°. How many degrees does it turn?
21. 21.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a servo motor (d) a buzzer
22. 22.🦾 A servo moves from 100° to 80°. How many degrees does it turn?
23. 23.🦾 A servo moves from 30° to 20°. How many degrees does it turn?
24. 24.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
26. 26.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
27. 27.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
28. 28.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle + 10
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
29. 29.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
30. 30.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
31. 31.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
32. 32.🦾 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 left (b) points up and right (c) points right (d) points straight up
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 10°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle + 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
36. 36.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
37. 37.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle + 20
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo moves from 70° to 130°. How many degrees does it turn?
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 left (c) points right (d) points straight up
40. 40.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor

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