Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 65 · 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 turns to an exact angle? (a) a servo motor (b) a DC motor
2. 2.⚙️ 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
3. 3.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
4. 4.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
5. 5.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
7. 7.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
8. 8.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
9. 9.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
10. 10.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
11. 11.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
12. 12.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
13. 13.🦾 A servo moves from 170° to 140°. How many degrees does it turn?
14. 14.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
15. 15.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
16. 16.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
17. 17.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle − 10
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 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 up and right (d) points left
19. 19.🦾 A servo program runs:
    angle = 80
    angle = angle + 60
    angle = angle − 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
20. 20.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
22. 22.🦾 A servo moves from 130° to 10°. How many degrees does it turn?
23. 23.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
24. 24.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
25. 25.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
26. 26.🦾 A servo moves from 170° to 50°. How many degrees does it turn?
27. 27.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
28. 28.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a DC motor (d) a buzzer
29. 29.🦾 A servo moves from 170° to 10°. How many degrees does it turn?
30. 30.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
31. 31.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
32. 32.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 50
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo moves from 30° to 130°. How many degrees does it turn?
34. 34.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
35. 35.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
36. 36.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo moves from 90° to 20°. How many degrees does it turn?
38. 38.🦾 A servo moves from 140° to 100°. How many degrees does it turn?
39. 39.🦾 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 straight up (d) points right
40. 40.🦾 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 right (b) points straight up (c) points up and right (d) points left

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