For the purpose of measuring the electric resistance of shoes through the body of the wearer standing on a metal ground plate, the American National Standards Institute (ANSI) specifies the circuit shown in Figure P27.14. The potential difference Δ V across the 1.00-MΩ resistor is measured with an ideal voltmeter. (a) Show that the resistance of the footwear is R shoes = 50.0 V − Δ V Δ V (b) In a medical test, a current through the human body should not exceed 150 μ A. Can the current delivered by the ANSI-specified circuit exceed 150 μ A? To decide, consider a person standing barefoot on the ground plate. Figure P27.14
For the purpose of measuring the electric resistance of shoes through the body of the wearer standing on a metal ground plate, the American National Standards Institute (ANSI) specifies the circuit shown in Figure P27.14. The potential difference Δ V across the 1.00-MΩ resistor is measured with an ideal voltmeter. (a) Show that the resistance of the footwear is R shoes = 50.0 V − Δ V Δ V (b) In a medical test, a current through the human body should not exceed 150 μ A. Can the current delivered by the ANSI-specified circuit exceed 150 μ A? To decide, consider a person standing barefoot on the ground plate. Figure P27.14
For the purpose of measuring the electric resistance of shoes through the body of the wearer standing on a metal ground plate, the American National Standards Institute (ANSI) specifies the circuit shown in Figure P27.14. The potential difference ΔV across the 1.00-MΩ resistor is measured with an ideal voltmeter. (a) Show that the resistance of the footwear is
R
shoes
=
50.0
V
−
Δ
V
Δ
V
(b) In a medical test, a current through the human body should not exceed 150 μA. Can the current delivered by the ANSI-specified circuit exceed 150 μA? To decide, consider a person standing barefoot on the ground plate.
The two figure panels show two ways to connect a real (non-ideal) voltmeter and a real ammeter in a circuit to calculate the resistance R. The internal resistance of the voltmeter is Rv and the internal resistance of the ammeter is Ra. The current flows from left to right in both panels, and the potential difference Vac between points a and c in both panels is the same.
In panel (a) the voltmeter reads Vac = 12.1 V and the ammeter reads I1 = 0.098 A.
In panel (b) the voltmeter reads Vab = 12.0 V and the ammeter reads I2 = 0.100 A.
I need help with Part E.
A capacitor with a capacitance of 3.5 μF is initially uncharged. It is connected in series with a switch of negligible resistance, a resistor with a resistance of 19 kΩ, and a battery that has a potential difference of 170 V.
What is the charge Q, in microcoulombs, on the capacitor when the current in the resistor equals one half its maximum value.
Chapter 28 Solutions
Physics for Scientists and Engineers, Technology Update (No access codes included)
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How To Solve Any Resistors In Series and Parallel Combination Circuit Problems in Physics; Author: The Organic Chemistry Tutor;https://www.youtube.com/watch?v=eFlJy0cPbsY;License: Standard YouTube License, CC-BY