Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 865 · 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 common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
2. 2.🦾 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 up and left (c) points right (d) points up and right
3. 3.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
4. 4.🦾 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 right (b) points straight up (c) points up and left (d) points left
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
6. 6.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
7. 7.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
9. 9.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a DC motor (d) a servo motor
10. 10.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
11. 11.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
12. 12.⚙️ 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
13. 13.🦾 A servo moves from 20° to 60°. How many degrees does it turn?
14. 14.🦾 A servo moves from 20° to 80°. How many degrees does it turn?
15. 15.🦾 A servo moves from 70° to 50°. How many degrees does it turn?
16. 16.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
17. 17.🦾 A servo program runs:
    angle = 100
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
18. 18.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
19. 19.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a servo motor (d) a buzzer
20. 20.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
21. 21.🦾 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 up and right (b) points right (c) points straight up (d) points up and left
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
24. 24.🦾 A servo moves from 160° to 80°. How many degrees does it turn?
25. 25.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) water (d) sound only
26. 26.🦾 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 left (b) points up and right (c) points right (d) points straight up
27. 27.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
28. 28.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
29. 29.🦾 A servo moves from 140° to 170°. How many degrees does it turn?
30. 30.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
31. 31.🦾 A servo moves from 70° to 100°. How many degrees does it turn?
32. 32.🦾 A servo moves from 70° to 40°. How many degrees does it turn?
33. 33.🦾 A servo moves from 20° to 10°. How many degrees does it turn?
34. 34.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
35. 35.🦾 A servo program runs:
    angle = 120
    angle = angle − 10
    angle = angle − 30
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
36. 36.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
37. 37.🦾 A servo moves from 100° to 0°. How many degrees does it turn?
38. 38.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo moves from 30° to 170°. How many degrees does it turn?
40. 40.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True

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