Industrial electronics
Don't do this
3 firing angle mistakes that cost marks
3 mistakes that cost marks in firing angle questions.
Quick check · tap an answer to continue
Lesson notes
Key points
- Calculator in degrees mode: Integrals in π need radians; switch your calculator mode or every cosine answer drifts wrong.
- Using Vrms not Vm: Formulas like Vm over π times one plus cos α need peak voltage: multiply Vrms by root two.
- Wrong formula for RL load: Continuous RL current uses two Vm over π cos α, not the resistive one plus cos α form.
Takeaway: Use peak voltage, radians and the right load formula.
Quick check: A 230 V rms supply is given; what Vm goes into the rectifier formula?
- 230 V
- 325 V
- 163 V
Vm equals √2 × 230, about 325 V; using 230 V is the classic mistake.
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