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Basic Electrical Principles Flashcards

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

Read the first 6 Basic Electrical Principles flashcards as text

  1. A technician measures a voltage of 24 VDC across a resistor with a resistance of 8 ohms. According to Ohm's Law, what is the current flowing through the resistor?

    Answer: 3 A

    Ohm's Law states that Current (I) = Voltage (V) / Resistance (R). In this scenario, I = 24V / 8Ω, which equals 3A.

  2. In a simple series circuit containing three light bulbs, which of the following statements is true about the electric current?

    Answer: The current is the same through all three bulbs.

    A primary characteristic of a series circuit is that it provides only a single path for the current to flow. Therefore, the amount of current is constant at all points throughout the circuit.

  3. An elevator's door motor operates on a 120V AC circuit and draws a current of 2 amps. How much power does the motor consume?

    Answer: 240 Watts

    Electrical power (P, in Watts) is calculated by multiplying voltage (V) by current (I). Therefore, P = 120V * 2A = 240W.

  4. If two components in an elevator's control panel are wired in parallel to a 24V DC power source, what is the voltage across each component?

    Answer: 24V across each

    In a parallel circuit, all components are connected across the same two points of the circuit. This means that the voltage across each component is the same as the source voltage.

  5. What is the primary characteristic that distinguishes Alternating Current (AC) from Direct Current (DC)?

    Answer: The direction of current flow periodically reverses in AC.

    The fundamental difference is that Direct Current (DC) flows in a single, constant direction, while Alternating Current (AC) periodically reverses its direction of flow.

  6. A technician is troubleshooting a circuit that keeps shutting off. They find a device designed to open the circuit automatically if the current becomes excessive. What is the primary function of this device?

    Answer: To protect the circuit from overcurrent conditions.

    Devices like fuses and circuit breakers are overcurrent protection devices. Their function is to interrupt the flow of electricity (open the circuit) when the current exceeds a safe level, protecting wiring and components from damage.