Explain why a voltage is induced across the ends of the coil when the magnet moves through it.

State one way to increase the magnitude of the induced voltage.

The beacon uses a light-emitting diode (LED) to provide light. When the LED is illuminated, it shows that:

• A. there is an electric current flowing through the circuit.
• B. the battery inside is completely uncharged.
• C. there is a short-circuit fault in the wiring.
• D. the current is alternating at a very high frequency.

The manufacturer states, "The LED is a more efficient light source than a traditional filament indicator bulb." Explain this statement in terms of energy transfers.