Recent content by Samar A

  1. Samar A

    Verification of the capacitance of a capacitor

    Oh, sorry, I corrected it. OK, I think because when the capacitance is greater the reactance of the capacitor will be less than the original one, so its effect in the circuit will be smaller, and then the phase difference between the current and the voltage will be smaller too. Am I right?
  2. Samar A

    Verification of the capacitance of a capacitor

    Homework Statement In the circuit shown in the figure below, the hase difference between the current and the voltage is 30 degrees, show how could you verify the capacitance of the conductor so that the phase difference could be 15 degrees. Homework Equations tan θ=-Xc/R (the phase difference...
  3. Samar A

    Hot Wire Ammeter: How it Works

    Yes, exactly, that is the principle used. But what confused me is that there is a heat generated and a heat radiated. I don't know if there will be an equilibrium so that the wire stops expanding or what it meant by saying that the rate of heat generated becomes equal to the rate of heat...
  4. Samar A

    Hot Wire Ammeter: How it Works

    We study AC circuits in our physics assignment this year, and we studied how the moving coil ammeter works to measure the intensity of the DC, but it couldn't measure it for an AC, so we should know about the hot-wire ammeter. I noticed the same too while searching on the internet. The hot wire...
  5. Samar A

    The slope of the tangent of the voltage curve.

    Oh, sorry. You are right I didn't study current sources, I am only a high school student. I thought a constant current is a direct current. Anyways, it is okay, I got it and understood the curve of an AC source.
  6. Samar A

    The slope of the tangent of the voltage curve.

    when feeding the capacitor with a DC source the current of the source flows to charge the capacitor and then it stops when the voltage across the capacitor is equal to the voltage across the terminals of the source. Then, nothing will happen there will be no sinusoidal curve as in the case of...
  7. Samar A

    The slope of the tangent of the voltage curve.

    Ok, why the value of (dV/dt) particularly represents the value of the slope?
  8. Samar A

    The slope of the tangent of the voltage curve.

    It says: (dV/dt) represents the slope of the tangent drawn to the curve. chh1995, I actually don't study calculus I know only a small amount of information about it. What I want to know is how the value (dV/dt) determines the slope?
  9. Samar A

    The slope of the tangent of the voltage curve.

    In an AC circuit with only a capacitor this diagram represents the relation between the current and the voltage in it (the current leads the voltage by 90 degrees). and because: (I= dQ/dt) and ( Q=C*V) where: Q is the amount of charge, C is the capacitance and V is the potential difference...
  10. Samar A

    Hot Wire Ammeter: How it Works

    In my textbook it says:"in the hot-wire ammeter the pointer stands at a definite reading when the temperature of platinum-iridium becomes constant and the wire stops expanding. That is achieved when the rate of heat radiated by the platinum-iridium wire becomes equal to the rate of heat...
  11. Samar A

    B What is the minimum voltage required to get characteristic spectrum

    Hi, The x-ray consists of the bremsstrahlung spectrum and the characteristic spectrum. We can get x-rays by using Coolidge tube where there are an applied voltage on the tube between the filament and the target. The bremsstrahlung is depeding on the PD between the filament and the target, but it...
  12. Samar A

    Hi, I am Samar

    Hi, everyone! My name is Samar, from Egypt, I am a high school student. I am very curious about physics and other branches of science, I am sure this website will help me to learn more. It is pleasure to be one of the members.
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