Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 256 · 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 reverses if wires swap? (a) a servo motor (b) a DC motor
2. 2.⚙️ 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
3. 3.🦾 A servo moves from 160° to 110°. How many degrees does it turn?
4. 4.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
5. 5.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 180° (d) 1800°
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
8. 8.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
9. 9.🦾 A servo moves from 160° to 60°. How many degrees does it turn?
10. 10.🦾 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
11. 11.🦾 A servo program runs:
    angle = 40
    angle = angle + 40
    angle = angle − 50
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
12. 12.🦾 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 right (b) points left (c) points right (d) points up and left
13. 13.🦾 A servo moves from 20° to 50°. How many degrees does it turn?
14. 14.🦾 A servo moves from 30° to 40°. How many degrees does it turn?
15. 15.🦾 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 right (c) points up and left (d) points left
16. 16.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
17. 17.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
18. 18.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
19. 19.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) water (d) sound only
20. 20.🦾 A servo program runs:
    angle = 120
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
21. 21.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
22. 22.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
23. 23.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
24. 24.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
25. 25.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
26. 26.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
27. 27.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
28. 28.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
29. 29.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
30. 30.🦾 A servo moves from 30° to 20°. How many degrees does it turn?
31. 31.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
32. 32.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 100
    angle = angle − 30
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
34. 34.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
35. 35.🦾 A servo moves from 100° to 150°. How many degrees does it turn?
36. 36.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
37. 37.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
38. 38.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
39. 39.🦾 A servo moves from 160° to 180°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 50
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?

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