Practise MYP Physics questions on 3.8 AC & DC and review the explanations to check your understanding.
Use these questions for topic practice and to find ideas you want to revisit in your notes or lessons.
In large-scale commercial power stations, which component is typically part of the 'rotor' that is physically spun to generate electricity?
Why does the output of a simple AC generator reverse its direction every half turn?
In a 100% efficient step-up transformer, the output voltage is times greater than the input voltage. How does the output current compare to the input current ?
An ideal step-down transformer reduces voltage from AC to AC. How does the current in the secondary coil () compare to the current in the primary coil ()?
During one complete rotation of a single coil within a simple AC generator, how many times does the induced voltage reach its peak magnitude (either positive or negative)?
The thick copper cables leading to the grid
A set of powerful electromagnets
The soft iron casing of the generator
The secondary winding of the step-up transformer
The battery connected to the generator reverses its polarity
The magnetic field switches its North and South poles every half turn
The coil stops moving momentarily at every half turn
Each side of the coil reverses its direction of motion relative to the magnetic field
is times
is times
is equal to
is of
