Electrodynamics (Grade 12 NSC Matric Physical Sciences): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What is the key characteristic of alternating current (AC)?
What is the key characteristic of alternating current (AC)?
It constantly changes direction
At what frequency does alternating current operate in South Africa?
At what frequency does alternating current operate in South Africa?
50 Hz
What does the circuit symbol for alternating current consist of?
What does the circuit symbol for alternating current consist of?
A circle with a wavy line inside it
Which advantage makes AC ideal for power transmission over long distances?
Which advantage makes AC ideal for power transmission over long distances?
High voltage transmission with low loss
If A, what is ?
If A, what is ?
A
Why is RMS value used instead of a simple average for AC?
Why is RMS value used instead of a simple average for AC?
Simple average would be zero
What is the value of current or voltage at a specific moment in an AC circuit called?
What is the value of current or voltage at a specific moment in an AC circuit called?
Instantaneous current or voltage
What formula calculates average power in AC circuits with only resistive components?
What formula calculates average power in AC circuits with only resistive components?
Why is power always positive in AC circuits?
Why is power always positive in AC circuits?
Current & voltage have same sign at any time
How do current and voltage behave in AC circuits compared to DC circuits?
How do current and voltage behave in AC circuits compared to DC circuits?
They vary continuously with time