Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 98 · 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.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
2. 2.🦾 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 right (b) points straight up (c) points right (d) points up and left
3. 3.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
4. 4.🦾 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 up and right (d) points right
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
6. 6.🦾 A servo program runs:
   angle = 160
   angle = angle + 10
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
8. 8.🦾 A servo moves from 0° to 110°. How many degrees does it turn?
9. 9.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
10. 10.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
11. 11.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
12. 12.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
13. 13.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
15. 15.🦾 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 left (c) points right (d) points up and left
16. 16.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
17. 17.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
18. 18.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
19. 19.🦾 A servo program runs:
    angle = 130
    angle = angle + 30
    angle = angle − 60
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
21. 21.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
22. 22.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
23. 23.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
27. 27.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) paint it red (d) swap its two wires
28. 28.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
29. 29.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
30. 30.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 30
    angle = angle − 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
31. 31.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
32. 32.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
33. 33.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle − 30
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle + 50
    angle = angle + 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
35. 35.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
36. 36.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
37. 37.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
38. 38.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 1800° (d) 10°
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 right (b) points left (c) points up and left (d) points up and right
40. 40.🦾 A servo program runs:
    angle = 160
    angle = angle + 10
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?

Free robotics lessons, practice and worksheets at talentjr.in/robotics-for-kids