Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 403 · 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.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
2. 2.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
3. 3.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
4. 4.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
5. 5.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
6. 6.🦾 A servo program runs:
   angle = 50
   angle = angle + 40
   angle = angle + 30
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
7. 7.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) water (d) light
8. 8.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
9. 9.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
10. 10.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
11. 11.🦾 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 left (b) points straight up (c) points right (d) points up and right
12. 12.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) shake it (d) add more wheels
13. 13.🦾 A servo moves from 60° to 10°. How many degrees does it turn?
14. 14.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 18° (d) 1800°
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
16. 16.🦾 A servo moves from 10° to 20°. How many degrees does it turn?
17. 17.🦾 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 left (b) points up and left (c) points up and right (d) points right
18. 18.🦾 A servo moves from 100° to 10°. How many degrees does it turn?
19. 19.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle + 10
    angle = angle + 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 A servo program runs:
    angle = 40
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo moves from 60° to 120°. How many degrees does it turn?
22. 22.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
23. 23.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a DC motor (d) a fan
24. 24.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
25. 25.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
26. 26.🦾 A servo moves from 40° to 140°. How many degrees does it turn?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
29. 29.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
30. 30.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
31. 31.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
32. 32.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
33. 33.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle − 10
    angle = angle − 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
34. 34.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
35. 35.🦾 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 straight up (b) points right (c) points up and right (d) points up and left
36. 36.🦾 A servo moves from 20° to 40°. How many degrees does it turn?
37. 37.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
38. 38.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
39. 39.🦾 A servo moves from 130° to 100°. How many degrees does it turn?
40. 40.🦾 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 up and right (d) points left

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