What components are used to boost voltage in the circuit?

• A. Transformers
• B. Resistors
• C. Capacitors
• D. Diodes

Answer: (A)

Voltage boosting in circuits is achieved with devices that transfer energy between circuits using magnetic induction. A transformer does this by having two coils on a shared core. When the primary coil carries alternating current, its changing magnetic field induces voltage in the secondary coil. The output voltage scales with the turns ratio: more turns on the secondary than the primary produce a higher voltage. This is why transformers are used to step voltage up (or down) in AC systems and to provide isolation between circuits. In DC-only situations, a transformer can’t boost voltage by itself; you’d use a DC-DC boost converter with an inductor, a switch, a diode, and capacitors. Resistors simply drop or divide voltage and dissipate heat, capacitors store energy but don’t raise the steady voltage by themselves, and diodes steer current or rectify.