20172018 ASVAB For Dummies with Online Practice by Rod Powers & Angie Papple Johnston

Author:Rod Powers & Angie Papple Johnston
Language: eng
Format: epub
ISBN: 9781119365679
Publisher: Wiley
Published: 2017-06-05T00:00:00+00:00

Capacitor: Capacitors store electric charge. They’re used with resistors in timing circuits because it takes time for a capacitor to fill with charge. They’re also used in filter circuits because capacitors easily pass AC (changing voltage) signals but they block DC (constant voltage) signals. Two types of capacitors include the following: Polarized capacitors must be connected the correct way in circuit.

Variable capacitors are used most often in radio tuning circuits.

Diode: Diodes allow electricity to flow in only one direction. The arrow of the circuit symbol shows the direction in which the current can flow. Diodes are the electrical version of a valve, and early diodes were actually called valves. Light-emitting diodes (LEDs) emit light when an electric current passes through them. Specialized diodes, called Zener diodes, do allow current in the opposite direction after a threshold is met.

Transistor: Transistors amplify current. For example, they can be used to amplify the small output current from a logic chip so it can operate a lamp, relay, or other high-current device.

Amplifier: An amplifier isn’t actually an electronic component but instead is a complex circuit. The block diagram symbol shows where an amplifier circuit would be connected. Amplifier circuits are used to magnify power, current, or voltage.

Antenna: An antenna is a device designed to receive and/or transmit radio signals.

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