Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 220 · 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 turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a servo motor (d) a DC motor
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
3. 3.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
4. 4.🦾 A servo moves from 10° to 160°. How many degrees does it turn?
5. 5.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
7. 7.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
8. 8.🦾 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 left (b) points left (c) points straight up (d) points up and right
9. 9.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (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.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 18° (d) 10°
13. 13.⚙️ A motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
14. 14.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
15. 15.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
16. 16.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) swap its two wires (d) shake it
17. 17.🦾 A servo moves from 40° to 30°. How many degrees does it turn?
18. 18.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
19. 19.🦾 A servo program runs:
    angle = 100
    angle = angle − 50
    angle = angle + 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo moves from 60° to 180°. How many degrees does it turn?
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 up and left (d) points right
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
24. 24.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
25. 25.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
26. 26.🦾 A servo program runs:
    angle = 70
    angle = angle + 50
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo moves from 70° to 0°. How many degrees does it turn?
28. 28.🦾 A servo program runs:
    angle = 140
    angle = angle − 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
30. 30.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
31. 31.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
32. 32.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
33. 33.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
34. 34.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
35. 35.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
36. 36.🦾 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 up and left (b) points straight up (c) points up and right (d) points left
37. 37.🦾 A servo moves from 10° to 110°. How many degrees does it turn?
38. 38.🦾 A servo program runs:
    angle = 60
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
39. 39.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
40. 40.🦾 A servo moves from 120° to 80°. How many degrees does it turn?

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