Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 57 · 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 spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a servo motor (d) a DC motor
2. 2.🦾 A servo program runs:
   angle = 50
   angle = angle + 10
   angle = angle + 10
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
3. 3.🦾 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 up and left (c) points up and right (d) points right
4. 4.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
5. 5.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
6. 6.🦾 A servo moves from 70° to 20°. How many degrees does it turn?
7. 7.🦾 A servo moves from 50° to 40°. How many degrees does it turn?
8. 8.🦾 A servo program runs:
   angle = 50
   angle = angle − 20
   angle = angle + 40
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
9. 9.🦾 A servo moves from 40° to 80°. How many degrees does it turn?
10. 10.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
11. 11.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
12. 12.🦾 A servo moves from 150° to 40°. How many degrees does it turn?
13. 13.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
14. 14.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a DC motor (d) a servo motor
15. 15.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
16. 16.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
17. 17.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
18. 18.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
19. 19.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 A servo moves from 120° to 90°. How many degrees does it turn?
21. 21.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
22. 22.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
23. 23.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
24. 24.🦾 A servo moves from 130° to 80°. How many degrees does it turn?
25. 25.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
26. 26.🦾 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 left (c) points up and right (d) points right
27. 27.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
28. 28.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
30. 30.🦾 A servo moves from 60° to 30°. How many degrees does it turn?
31. 31.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) water (d) light
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
33. 33.🦾 A servo moves from 10° to 40°. How many degrees does it turn?
34. 34.🦾 A servo moves from 130° to 110°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 100
    angle = angle − 20
    angle = angle − 60
    angle = angle + 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 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 straight up (b) points up and right (c) points up and left (d) points right
37. 37.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle + 20
    angle = angle − 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
38. 38.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
39. 39.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
40. 40.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True

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