College Physics

infusion, a catheter, or exposed pacemaker leads, a person is renderedmicroshock sensitive. In this condition, currents about 1/ ...

Figure 20.27A neuron with its dendrites and long axon. Signals in the form of electric currents reach the cell body through dend ...

Figure 20.29An action potential is the pulse of voltage inside a nerve cell graphed here. It is caused by movements of ions acro ...

Figure 20.30A nerve impulse is the propagation of an action potential along a cell membrane. A stimulus causes an action potenti ...

Most animal cells can fire or create their own action potential. Muscle cells contract when they fire and are often induced to d ...

AC current: AC voltage: alternating current: the next beat. The ECG measures components of depolarization and repolarization of ...

ampere: bioelectricity: direct current: drift velocity: electric current: electric power: electrocardiogram (ECG): microshock se ...

• The resistanceRof a cylinder of lengthLand cross-sectional areaAisR= ρL A , whereρis the resistivity of the material. • Values ...

6.Why isn’t a bird sitting on a high-voltage power line electrocuted? Contrast this with the situation in which a large bird hit ...

28.Could a person on intravenous infusion (an IV) be microshock sensitive? 29.In view of the small currents that cause shock haz ...

Problems & Exercises 20.1 Current 1.What is the current in milliamperes produced by the solar cells of a pocket calculator t ...

28.What current flows through a 2.54-cm-diameter rod of pure silicon that is 20.0 cm long, when1.00 × 10^3 Vis applied to it? (S ...

54.Alkaline batteries have the advantage of putting out constant voltage until very nearly the end of their life. How long will ...

(a) What is the cost of heating a hot tub containing 1500 kg of water from 10.0ºCto40.0ºC, assuming 75.0% efficiency to account ...

(a) Referring toFigure 20.34, find the time systolic pressure lags behind the middle of the QRS complex. (b) Discuss the reasons ...

734 CHAPTER 20 | ELECTRIC CURRENT, RESISTANCE, AND OHM'S LAW This content is available for free at http://cnx.org/content/col114 ...

21 CIRCUITS, BIOELECTRICITY, AND DC INSTRUMENTS Figure 21.1The complexity of the electric circuits in a computer is surpassed by ...

21 Circuits, Bioelectricity, and DC Instruments Electric circuits are commonplace. Some are simple, such as those in flashlights ...

Connections: Conservation Laws The derivations of the expressions for series and parallel resistance are based on the laws of co ...

P (21.12) 1 =I 2 R 1 = (0.600 A) 2 (1.00 Ω ) = 0.360 W. Similarly, P (21.13) 2 =I (^2) R 2 = (0.600 A) (^2) (6.00 Ω ) = 2.16 W a ...