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What does the 'duty cycle' in PWM control on a Raspberry Pi?

easy📝 Conceptual Q2 of 15
Raspberry Pi - PWM Output
What does the 'duty cycle' in PWM control on a Raspberry Pi?
AThe frequency of the PWM signal
BThe percentage of time the signal is ON during one cycle
CThe voltage level of the Raspberry Pi pin
DThe total time the Raspberry Pi runs the program
Step-by-Step Solution
Solution:

  1. Step 1: Define duty cycle in PWM context

    The duty cycle is the fraction of one PWM period when the signal is ON (high voltage).

  2. Step 2: Understand its effect on device control

    Changing the duty cycle changes how long the device receives power, controlling brightness or speed.

  3. Final Answer:

    The percentage of time the signal is ON during one cycle -> Option B

  4. Quick Check:

    Duty cycle = ON time percentage [OK]
Quick Trick: Duty cycle controls ON time percentage in PWM [OK]
Common Mistakes:
  • Confusing duty cycle with frequency
  • Thinking duty cycle changes voltage level
  • Assuming duty cycle affects program runtime

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