What happens when pressure is applied to a piezoelectric crystal?

What happens when pressure is applied to a piezoelectric crystal?

• A. It emits an electrical signal
• B. It increases temperature
• C. It emits radio waves
• D. It emits photons

Answer: (A)

When you press a piezoelectric crystal, it generates an electrical signal. This happens because the crystal’s lattice lacks a center of symmetry, so when it’s deformed, electric dipoles shift and surface charges appear. That built‑up charge creates a voltage across the crystal that can be measured or fed into a circuit, converting mechanical pressure into an electrical signal. The energy isn’t primarily released as heat, radio waves, or photons from simply applying pressure—the defining output is the produced electrical signal.

When you press a piezoelectric crystal, it generates an electrical signal. This happens because the crystal’s lattice lacks a center of symmetry, so when it’s deformed, electric dipoles shift and surface charges appear. That built‑up charge creates a voltage across the crystal that can be measured or fed into a circuit, converting mechanical pressure into an electrical signal. The energy isn’t primarily released as heat, radio waves, or photons from simply applying pressure—the defining output is the produced electrical signal.