Which component is used to boost current in a circuit so a lamp can operate?

Which component is used to boost current in a circuit so a lamp can operate?

• A. Amplifier
• B. Transistor
• C. Antenna
• D. Circuit diagrams

Answer: (B)

Transistors serve as current amplifiers, allowing a small input current to control a larger current through a load. When the base receives a signal, the transistor conducts between the collector and emitter, letting current flow from the power supply through the lamp. This provides the lamp with the current it needs while the control circuit only supplies a tiny base current. It also lets the lamp be switched on and off with a small control signal. The other options don’t fit: an amplifier is a broader concept and isn’t a specific device used to drive a load like a lamp; an antenna is for radio waves; circuit diagrams are drawings, not active components.

Transistors serve as current amplifiers, allowing a small input current to control a larger current through a load. When the base receives a signal, the transistor conducts between the collector and emitter, letting current flow from the power supply through the lamp. This provides the lamp with the current it needs while the control circuit only supplies a tiny base current. It also lets the lamp be switched on and off with a small control signal. The other options don’t fit: an amplifier is a broader concept and isn’t a specific device used to drive a load like a lamp; an antenna is for radio waves; circuit diagrams are drawings, not active components.