What is the electric field inside the wire? V/m What is the current density inside the wire?
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What is the electric field inside the wire? V/m
What is the current density inside the wire? mm
The electric field inside the wire is,
the conductivity of nichrome wire is
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- p5Question A spool of copper wire 200 m long and with a diameter of 0.320 mm is at 20.0°C. For copper, the resistivity is 1.70 X 10-8 Q·m and the temperature coefficient of resistivity is 3.90 X 10-3 (°C)~1. (a) What is the magnitude of the electric field (in V/m) in the wire if it carries a current of 0.400 A? V/m (b) What is the electric power (in W) delivered to the spool while it carries a current of 0.400 A? W (c) What is the power (in W) delivered to the spool if the potential difference across the wire is held constant and the temperature is increased to 280°C? WA fuse in an electric circuit is a wire that is designed to melt, and thereby open the circuit, if the current exceeds a predetermined value. Suppose that the material to be used in a fuse melts when the current density rises to 410 A/cm². What diameter of cylindrical wire should be used to make a fuse that will limit the current to 0.57 A? Number i Units
- A 10 μF capacitor with an initial energy of 0.1 J is discharged through a 7.5 MΩ resistor. What is the initial charge on the capacitor? The charge, Q0 = Units . What is the current through the resistor when the discharge starts? The current, I0 = Units . Determine the potential difference across the capacitor and the rate at which the thermal energy is dissipating in the resistance 0.9 min after the discharge starts. The potential difference across C, VC = Units . The power dissipated in R, P = Units .2 What is the SI unit of resistance? A Ω V F In solid metals, which charged particles are free to move throughout the object? Select any/all correct answers. protons neutrons electrons 4 Which factor(s) affect the current in a conductor? Select any/all correct answers. cross-section area density of the charged particles drift speed of the charged partiçlesThe electron beam inside an old television picture tube is 0.40 mmmm in diameter and carries a current of 50 μA. This electron beam impinges on the inside of the picture tube screen. What is the current density in the electron beam and how many electrons strike the screen each second? The electrons move with a velocity of 3.0×107m/s. What electric field strength is needed to accelerate electrons from rest to this velocity in a distance of 5.0 mm? Each electron transfers its kinetic energy to the picture tube screen upon impact. What is the power delivered to the screen by the electron beam?
- The current in a 100 watt lightbulb is 0.90 AA. The filament inside the bulb is 0.20 mmmm in diameter. What is the current density in the filament? What is the electron current in the filament?Current and Resistance Problem 17: An unknown wire in a circuit has a circular cross-section with diameter 2.5 mm. It carries a current of 8.8 mA. Part (a) What is the current density, in milliamperes per square centimeter, in this wire? Part (b) If you assume the drift velocity in this wire is 1 × 10-2 cm/s, what is the density of charge carriers per cubic centimeter? Part (c) If the conductivity in this wire is 1.5 × 106 Ω-1 m-1, what is the average time between collisions, in nanoseconds?