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Electronics: Circuits and Schematics Flashcards

6 cards from real AFCT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Electronics: Circuits and Schematics flashcards as text

  1. In a simple electrical circuit, what does an 'open circuit' signify?

    Answer: The path for current flow is incomplete or broken.

    An open circuit is an incomplete electrical path where current cannot flow. This occurs when there is a break in the circuit, such as a switch being in the 'off' position or a wire being disconnected, preventing the flow of electricity.

  2. According to Ohm's Law, if the voltage in a circuit is doubled while the resistance remains constant, what happens to the current?

    Answer: It is doubled.

    Ohm's Law is stated as V = I * R (Voltage = Current * Resistance). If voltage (V) is doubled and resistance (R) is unchanged, the current (I) must also double to maintain the equality. Current is directly proportional to voltage.

  3. What is the total resistance (RT) of a circuit with three resistors (R1=10Ω, R2=20Ω, R3=30Ω) connected in series?

    Answer: 60Ω

    In a series circuit, the total resistance is the sum of all individual resistances. The current flows through each resistor sequentially, so their resistances add up. Therefore, RT = R1 + R2 + R3.

  4. In a schematic diagram, what does a circle with a sine wave (~) inside it represent?

    Answer: An AC voltage source

    This is the standard symbol for an Alternating Current (AC) voltage source. The sine wave illustrates the nature of AC, where the voltage and current periodically reverse direction. This is distinct from a DC source, which is often shown with '+' and '-' symbols.

  5. In a parallel circuit, the total resistance is always...

    Answer: less than the smallest individual resistance.

    When resistors are connected in parallel, multiple paths are created for the current to flow. This makes it easier for the total current to flow, effectively reducing the overall resistance. The total resistance will always be smaller than the value of the smallest individual resistor in the parallel combination.

  6. What is the primary purpose of a fuse in an electrical circuit?

    Answer: To protect the circuit from overcurrent

    A fuse is a safety device designed to protect a circuit from damage caused by excessive current. It contains a thin wire that melts and breaks the circuit ('blows') if the current exceeds a specific level, thus stopping the flow of electricity and preventing damage to other components.