Treatment of Heart Failure. A heart defibrillator is used to enable the heart to start beating if it has stopped. This is done by passing a large current of 12 A through the body at 25 V for a very short time, usually about 3.0 ms. (a) What power does the defibrillator deliver to the body, and (b) how much energy is transferred?

Treatment of Heart Failure. A heart defibrillator is used to enable the heart to start beating if it has stopped. This is done by passing a large current of 12 A through the body at 25 V for a very short time, usually about 3.0 ms. (a) What power does the defibrillator deliver to the body, and (b) how much energy is transferred?

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter21: Current And Direct Current Circuits

Section: Chapter Questions

Problem 19P

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Integrated Concepts (a) What energy is dissipated by a lightning bolt having a 20,000-A current, a voltage of 1.00102 MV, and a length of 1.00 ms? (b) What mass of tree sap could be raised from 18.0°C to its boiling point and then evaporated by this energy, assuming sap has the same thermal characteristics as water?
An electric eel generates electric currents through its highly specialized Hunters organ, in which thousands of disk-shaped cells called electrocytes are lined up in series, very much in the same way batteries are lined up inside a flashlight. When activated, each electrocyte can maintain a potential difference of about 150 mV at a current of 1.0 A for about 2.0 ms. Suppose a grown electric eel has 4.0 103 electrocytes and can deliver up to 3.00 102 shocks in rapid series over about 1.0 s. (a) What maximum electrical power can an electric eel generate? (b) Approximately how much energy does it release in one shock? (c) How high would a mass of 1.0 kg have to be lifted so that its gravitational potential energy equals the energy released in 3.00 102 such shocks?
When operating on a 120-V circuit, an electric heater receives 1.30 103 W of power, a toaster receives 1.00 103 W, and an electric oven receives 1.54 103 W. If all three appliances are connected in parallel on a 120-V circuit and turned on, what is the total current drawn from an external source? (a) 24.0 A (b) 32.0 A (c) 40.0 A (d) 48.0 A (e) none of those answers
A heart defibrillator is used to enable the heart to start beating if it has stopped. This is done by passing a large current of 12 A through the body at 25 V for a very short time, usually about 3 milliseconds. How much energy is transferred from the defibrillator to the body? Choices: 0.30 J 0.90 J 900 J 300 J
An 8.00-ft extension cord has two 18-gauge copper wires, each having a diameter of 1.024 mm. At what rate is energy delivered to the resistance in the cord when it is carrying a current of (a) 1.00 A and (b) 10.0 A?
On a sunny day, a rooftop solar panel delivers 60 W of power to the house at an emf of 17 V. How much current flows through the panel?
A heart defibrillator is used to enable the heart to start beating if it has stopped. This is done by passing a large current of 12 A through the body at 25 V for a very short time, usually about 3 milliseconds. How much energy is transferred from the defibrillator to the body?
Assuming 89.0% efficiency for the conversion of electrical power by the motor, what current (in A) must the 12.0 V batteries of a 755 kg electric car be able to supply in order to do the following? (a) to accelerate from rest to 25.0 m/s in 1.00 min. A (b) to climb a 2.00 ✕ 102 m high hill in 2.00 min at a constant 25.0 m/s speed while exerting 5.10 ✕ 102 N of force to overcome air resistance and friction. A (c)to travel at a constant 25.0 m/s speed, exerting a 5.10 ✕ 102 N force to overcome air resistance and friction. A
A flashlight, which uses a 3.0 V battery, is turned on for 2.0 minutes. If the current in the flashlight is 100 mA, what is the energy dissipated? A. 121 J B. 9.0 J C. 72 J D. 36 J
1) A copper cable is designed to carry a current of 330 A with a power loss of 2.00 W/m. What is the required radius of this cable? pcopper = 1.7 x 10-8 0.0103 m 0.0009 m 0.0446 m 0.0172 m 2) An electric utility company supplies a customer’s house from the main power lines (120 V) with two copper wires, each of which is 110.0 m long and has a resistance of 0.12 per 400 m. Find the power delivered to the customer and assume that a load current at the customer’s house is 140 A. 32,340 W 16,800 W 16,153 W 15,506 W
At 20°C, a 7.5 m long copper wire has a cross-sectional diameter of 1 mm. If 15 A of current flow through the wire, what is the potential difference (in V) of the wire at 20°C? ρcopper = 1.68×10-8 Ω·m αcopper = 0.0039 /C°
In the figure R1 = 9.81 kΩ, R2 = 15.4 kΩ, C = 0.433 μF, and the ideal battery has emf ε = 18.0 V. First, the switch is closed a long time so that the steady state is reached. Then the switch is opened at time t = 0. What is the current in resistor 2 at t = 3.60 ms?