Technician: Current Flowing in a Resistor

Ohms law voltage source

What is the current flowing through a 24-ohm resistor connected across 240 volts? [T5D09] A. 24,000 amperes B. 0.1 amperes C. 10 amperes D. 216 amperes Get out your calculators, because this is a cut-and-dried case of needing to use Ohm’s law. Ohm’s law defines the relationship beteween voltage, current, and resistance in a circuit.  …

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Technician: Amplifier Components

Amplifier Components

Which of the following electronic components can amplify signals? [T6B05] A. Transistor B. Variable resistor C. Electrolytic capacitor D. Multi-cell battery The answer is, as luck would have it, A. Transistor.  The transistor is probably the miracle of 20th century technology.  It’s an amplifier, a switch, and so much more. None of the other components …

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Technician: Ammeter Current Display

Ammeter Current Display

If an ammeter calibrated in amperes is used to measure a 3000-milliampere current, what reading would it show? [T5B06] A. 0.003 amperes B. 0.3 amperes C. 3 amperes D. 3,000,000 amperes Don’t panic! This is a simple question about unit conversions, nothing more. Remember your definitions of metric prefixes.  Milli means one one-thousandth, or 0.001.  …

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