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.
A well-insulated electric water heater warms 107 kg of water from 20.0°C to 41.0°C in 29.0 min. Find the resistance (in Ω) of its heating element, which is connected across a 240 V potential difference.
Ω
(b)
What If? How much additional time (in min) would it take the heater to raise the temperature of the water from 41.0°C to 100°C?
min
(c)
What would be the total amount of time (in min) required to evaporate all of the water in the heater starting from 20.0°C?
min
E10P2
(a) A well-insulated electric water heater warms 125 kg of water from 20.0°C to 53.0°C in 33.0 min. Find the resistance (in Q2) of its heating element, which is connected across a 240 V potential difference.
Ω
(b) What If? How much additional time (in min) would it take the heater to raise the temperature of the water from 53.0°C to 100°C?
min
(c) What would be the total amount of time (in min) required to evaporate all of the water in the heater starting from 20.0°C?
min
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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