Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 467 · 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 servo moves from 60° to 100°. How many degrees does it turn?
2. 2.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
3. 3.🦾 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 straight up (b) points left (c) points right (d) points up and right
4. 4.⚙️ DC motor or servo motor: which one spins faster with more V? (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.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
7. 7.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
8. 8.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
9. 9.🦾 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 up and left (b) points left (c) points straight up (d) points up and right
10. 10.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
11. 11.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
12. 12.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
13. 13.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
14. 14.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) shake it (d) add more wheels
15. 15.⚙️ 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
16. 16.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a buzzer (d) a servo motor
17. 17.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) light (d) sound only
18. 18.🦾 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 right (b) points up and left (c) points up and right (d) points straight up
19. 19.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
21. 21.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
23. 23.🦾 A servo program runs:
    angle = 50
    angle = angle + 10
    angle = angle + 50
    angle = angle − 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo program runs:
    angle = 120
    angle = angle + 60
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo moves from 80° to 120°. How many degrees does it turn?
27. 27.🦾 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 right (c) points up and left (d) points straight up
28. 28.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
29. 29.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
30. 30.🦾 A servo program runs:
    angle = 40
    angle = angle + 30
    angle = angle − 20
    angle = angle + 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
31. 31.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
32. 32.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
33. 33.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
34. 34.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
35. 35.🦾 A servo moves from 10° to 70°. How many degrees does it turn?
36. 36.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
37. 37.🦾 A servo moves from 40° to 150°. How many degrees does it turn?
38. 38.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = 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: “spins faster with more V” is true of a servo motor. (a) True (b) False
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?

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