Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 480 · 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.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) add more wheels (d) swap its two wires
2. 2.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
3. 3.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
5. 5.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
6. 6.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
7. 7.🦾 A servo moves from 10° to 80°. How many degrees does it turn?
8. 8.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
9. 9.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
10. 10.🦾 A servo moves from 90° to 110°. How many degrees does it turn?
11. 11.🦾 A servo moves from 150° to 90°. How many degrees does it turn?
12. 12.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
13. 13.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
14. 14.🦾 A servo program runs:
    angle = 30
    angle = angle − 30
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 A servo program runs:
    angle = 40
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo moves from 110° to 170°. How many degrees does it turn?
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
18. 18.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
19. 19.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
20. 20.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
21. 21.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
22. 22.🦾 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 left (c) points right (d) points straight up
23. 23.🦾 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 left (b) points up and right (c) points right (d) points up and left
24. 24.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
25. 25.🦾 A servo moves from 110° to 140°. How many degrees does it turn?
26. 26.🦾 A servo program runs:
    angle = 130
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 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 up and left (c) points left (d) points right
28. 28.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a light sensor (d) a buzzer
29. 29.🦾 A servo program runs:
    angle = 120
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
31. 31.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 10° (d) 1800°
32. 32.🦾 A servo moves from 20° to 170°. How many degrees does it turn?
33. 33.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
34. 34.🦾 A servo moves from 110° to 10°. How many degrees does it turn?
35. 35.🦾 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 straight up (b) points up and left (c) points right (d) points up and right
36. 36.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
37. 37.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
38. 38.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
39. 39.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
40. 40.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?

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