Electrical

    Cards (45)

    • What is electrical resistance?
      Electrical resistance is a property of materials that opposes the flow of electric current.
    • How is resistance measured?
      Resistance is measured in ohms (Ω).
    • What type of materials have low resistance?
      Good conductors, like copper, have low resistance.
    • What type of materials have high resistance?
      Insulators, like rubber, have high resistance.
    • What are resistors designed for?
      Resistors are components designed to have a specific resistance.
    • How does the length and thickness of a wire affect its resistance?
      A long, thin wire has more resistance than a short, thick wire of the same material.
    • What is the analogy used to explain electrical resistance?
      - Electrical resistance is like a "traffic jam" for electricity. - Good conductors allow easy flow (low resistance). - Insulators block flow (high resistance).
    • Who formulated Ohm's law and when?
      Ohm's law was formulated by Georg Ohm in 1827.
    • What does Ohm's law describe?

      Ohm's law describes the relationship between voltage, current, and resistance in an electrical circuit.
    • What is the mathematical expression of Ohm's law?
      The mathematical expression of Ohm's law is V=V =IR I \cdot R.
    • What do the variables in Ohm's law represent?
      In Ohm's law, V is voltage (volts), I is current (amperes), and R is resistance (ohms).
    • How does Ohm's law relate current to voltage and resistance?

      Ohm's law states that current is directly proportional to voltage and inversely proportional to resistance.
    • How can Ohm's law be rearranged to solve for current?
      Ohm's law can be rearranged to I=I =VR \frac{V}{R}.
    • How can Ohm's law be rearranged to solve for resistance?
      Ohm's law can be rearranged to R=R =VI \frac{V}{I}.
    • What is the relationship between voltage and current in a linear material?
      The relationship between voltage and current is linear, resulting in a straight line on a V-I graph.
    • What are the limitations of Ohm's law?
      Ohm's law doesn't apply to all materials or conditions, especially non-linear components like diodes.
    • How does temperature affect resistance in materials?
      The resistance of most materials changes with temperature, affecting the application of Ohm's law.
    • What is the power equation related to Ohm's law?
      The power equation is P=P =VI V \cdot I, where P is power in watts.
    • How would you calculate the current flowing through a 4Ω resistor connected to a 12V battery using Ohm's law?
      The current would be calculated as I=I =12V4Ω= \frac{12V}{4Ω} =3A 3A.
    • What is the relationship between voltage, current, and resistance according to Ohm's law?
      1. Voltage and Current: Directly proportional - More voltage = More current - Less voltage = Less current 2. Resistance and Current: Inversely proportional - More resistance = Less current - Less resistance = More current 3. Voltage and Resistance: Directly proportional when current is constant - More voltage = More resistance - Less voltage = Less resistance
    • How can the relationship between voltage, current, and resistance be visualized?
      The relationship can be visualized using the Ohm's law triangle.
    • What does the Ohm's law triangle represent?
      The Ohm's law triangle represents the relationship between voltage (V), current (I), and resistance (R).
    • What happens to resistance if voltage increases while keeping current constant?
      Resistance must increase.
    • What happens to resistance if voltage decreases while keeping current constant?
      Resistance must decrease.
    • How can voltage be compared to water in a pipe?
      Voltage is like water pressure in a pipe.
    • How can current be compared to water in a pipe?
      Current is like the amount of water flowing through the pipe.
    • How can resistance be compared to water in a pipe?
      Resistance is like how narrow the pipe is.
    • What happens to current if the resistance increases while voltage remains constant?
      Current decreases.
    • What is the relationship between voltage and resistance when current is constant?
      If voltage increases, resistance must increase to keep current constant.
    • What is the unit of measurement for voltage?
      Volts (V)
    • What happens to current if the voltage increases while resistance remains constant?
      Current increases.
    • What is the unit of measurement for current?
      Amperes (A)
    • What is the unit of measurement for resistance?

      Ohms (Ω)
    • Who is the unit of voltage named after?
      Alessandro Volta
    • Who is the unit of current named after?
      André-Marie Ampère
    • What is the relationship between volts, amperes, and ohms?

      - 1 volt = 1 ampere * 1 ohm - This relationship is consistent with Ohm's law: V=V =IR I \cdot R
    • What is an example of a voltage provided by a typical AA battery?
      1.5V
    • Who is the unit of resistance named after?
      Georg Ohm
    • What is a common household voltage in many countries?
      230V or 120V
    • How can you rearrange Ohm's law to find resistance?
      R=R =VI \frac{V}{I}
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