By Jason Thompson Updated Mar 24, 2022
Electricity is the flow of electrons through a conductive material such as wire. Different devices require different current types: DC (direct current) flows in a single direction, while AC (alternating current) oscillates back and forth. Engineers design devices to convert between these currents to meet the needs of various equipment.
A transformer modifies the voltage and current of an AC source while preserving its alternating nature. When the transformer steps up the current, it reduces the voltage; stepping down the current increases the voltage. This exchange keeps the power constant, making transformers ideal for delivering household voltage to low‑power appliances.
It consists of two electrically isolated coils. The primary coil, connected to the AC supply, creates a changing magnetic field. This field induces a voltage in the secondary coil. The ratio of currents between the coils matches the ratio of turns in the secondary to the primary coil, allowing precise voltage control.
A rectifier converts AC into DC, delivering a steady voltage and current needed by many electronic devices. While AC is efficient for long‑distance transmission, most electronics rely on DC for stable operation. The rectifier is thus a crucial component of power adapters.
Typical rectifiers use a bridge of four silicon diodes arranged in a diamond pattern. The diodes permit current to flow only in one direction, regardless of the AC input’s polarity, producing a unidirectional DC output.
