Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 250 · 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) False (b) True
2. 2.🦾 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 right (b) points up and right (c) points left (d) points straight up
3. 3.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
4. 4.🦾 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 straight up (b) points right (c) points up and right (d) points left
5. 5.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
6. 6.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a DC motor (d) a light sensor
7. 7.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) sound only (d) water
8. 8.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
9. 9.🦾 A servo program runs:
   angle = 140
   angle = angle − 10
   angle = angle + 30
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
10. 10.🦾 A servo moves from 0° to 60°. How many degrees does it turn?
11. 11.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
12. 12.⚙️ 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
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
14. 14.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
15. 15.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
16. 16.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
18. 18.🦾 A servo program runs:
    angle = 70
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle + 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
20. 20.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
22. 22.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
23. 23.🦾 A servo program runs:
    angle = 130
    angle = angle − 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
24. 24.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
26. 26.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
28. 28.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
29. 29.⚙️ DC motor or servo motor: which one has a signal wire? (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.🦾 A servo moves from 40° to 80°. How many degrees does it turn?
32. 32.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
33. 33.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
34. 34.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
35. 35.⚙️ 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
36. 36.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
37. 37.🦾 A servo moves from 20° to 50°. How many degrees does it turn?
38. 38.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
40. 40.🦾 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 right (b) points up and left (c) points up and right (d) points left

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