Generating Electricity Flashcards
All 4 cards in this deck
What are the steps to demonstrate electromagnetic induction in the laboratory?
e.g. using a bar magnet, a coil of wire and a sensitive voltmeter
- Connect the voltmeter across the two ends of the coil.
- Hold the magnet with its axis parallel to the axis of the coil.
- Move the magnet into the coil — the voltmeter shows a reading.
True or false? A potential difference is induced while a magnet is held still inside a coil of wire.
False. There must be relative movement (a changing magnetic field) for a p.d. to be induced.
Apart from moving the magnet, how else can a current be induced in a coil connected in a circuit?
By moving the coil relative to the magnet — only the relative movement matters.
How is the generator effect used in the large-scale generation of electrical energy?
A turbine spins a magnet inside coils (or coils in a magnetic field), so the changing magnetic field induces a potential difference and current.