Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 734 · 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) light (b) water (c) sound only (d) movement
2. 2.🦾 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 left (d) points up and right
3. 3.🦾 A servo program runs:
   angle = 130
   angle = angle − 50
   angle = angle − 10
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
4. 4.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
5. 5.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
6. 6.🦾 A servo moves from 180° to 0°. How many degrees does it turn?
7. 7.🦾 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 straight up (c) points left (d) points right
8. 8.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
9. 9.🦾 A servo program runs:
   angle = 40
   angle = angle − 30
   angle = angle + 20
   angle = angle + 50
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
11. 11.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
12. 12.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
14. 14.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
15. 15.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
16. 16.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
17. 17.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
18. 18.🦾 A servo moves from 120° to 90°. How many degrees does it turn?
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
20. 20.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
21. 21.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
22. 22.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
23. 23.🦾 A servo program runs:
    angle = 170
    angle = angle − 10
    angle = angle − 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
24. 24.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
25. 25.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
26. 26.🦾 A servo moves from 160° to 60°. How many degrees does it turn?
27. 27.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
28. 28.🦾 A servo program runs:
    angle = 90
    angle = angle − 20
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo moves from 80° to 30°. 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.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
32. 32.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a fan (d) a servo motor
33. 33.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
34. 34.🦾 A servo moves from 60° to 110°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 50
    angle = angle − 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo moves from 180° to 10°. How many degrees does it turn?
37. 37.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
38. 38.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
39. 39.🦾 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 straight up (d) points up and left
40. 40.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor

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