Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 591 · 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) 180° (c) 10° (d) 1800°
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
3. 3.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
4. 4.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
6. 6.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
7. 7.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
8. 8.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a DC motor (d) a buzzer
9. 9.🦾 A servo program runs:
   angle = 110
   angle = angle + 60
   angle = angle − 40
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ 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
11. 11.🦾 A servo moves from 70° to 100°. How many degrees does it turn?
12. 12.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
13. 13.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle + 20
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
14. 14.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
15. 15.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo moves from 0° to 130°. How many degrees does it turn?
17. 17.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water
18. 18.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle − 50
    angle = angle + 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo moves from 150° to 180°. How many degrees does it turn?
20. 20.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
21. 21.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle + 40
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
22. 22.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
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 right (c) points up and left (d) points up and right
24. 24.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
25. 25.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
26. 26.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
27. 27.⚙️ 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
28. 28.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
29. 29.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
30. 30.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
31. 31.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
32. 32.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
33. 33.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
35. 35.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
36. 36.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo program runs:
    angle = 120
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
38. 38.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
39. 39.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
40. 40.🦾 A servo moves from 90° to 180°. How many degrees does it turn?

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