Loudspeakers and induced potential difference
How a loudspeaker uses the motor effect, then the reverse: moving a magnet and a coil induces a potential difference, what makes it bigger, and which way the current flows.
You will be able to
- Explain how a loudspeaker or headphones make sound (Physics only)
- Say when a potential difference is induced and what makes it bigger (Higher)
- Predict the direction of an induced current from the change that caused it (Higher)
25 minutes, 8 exam-style questions.