25.41    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 though 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?

Batteries are rated in terms of ampere-hours (A.h). For example, a battery that can produce a current of 2.00 A for 3.00 h is rated at 6.00 A·h. (a) What is the total energy stored in a 12.0-V battery rated at 53.0 A.h? kWh (b) At $0.0650 per kilowatt-hour, what is the value of the electricity produced by this battery? NOTE: Enter your response with hundredths precision.

In the figure R1 = 7.00 0, R2 = 21.0 Q, and the ideal battery has emf ɛ = 12.7 V. (a) What is the magnitude of current i? (b) How much energy is dissipated by all four resistors in 1.15 min? R ww i R2 ww (a) Number i Units (b) Number i Units

1. Adjust the voltage to 0.05x V and adjust the plate area to 10y mm² and the separation distance to 0.2z mm. What is the magnitude of the charge (in Coulombs) stored in each plates for x= −27, y= 21, and z= 39?  2. Adjust the voltage to 0.05x V and adjust the plate area to 10y mm² and the separation distance to 0.2z mm. What is the magnitude of the Potential Energy in Joules in capacitor for  x= -8 and y= 10? 3. Adjust the voltage to 0.05x V and adjust the plate area to 10y mm² and the separation distance to 0.2z mm. What is the magnitude of the charge stored in each plates for x= −25 and y= 14?

In the figure R1 = 5.43 Q, R2 = 16.3 Q, and the ideal battery has emf ɛ = 10.6 V. (a) What is the magnitude of current i? (b) How much energy is dissipated by all four resistors in 0.976 min? R1 R2 (a) Number i Units (b) Number i Units

In the figure R₁ = 4.48 2, R₂ = 13.42, and the ideal battery has emf & = 12.1 V. (a) What is the magnitude of current i₁? (b) How much energy is dissipated by all four resistors in 2.91 min? Re ww (a) Number (b) Number www R₁ R Units Units