Chapter 27, Problem 007 from A wire of resistance 5.1 Ω is connected to a battery whose emf ε is 4.0 V and whose internal resistance is 0.69 Ω. In 2.1 min, how much energy is (a) transferred from eergy In the narerg s() chemical to electrical form in the battery, (b) dissipated as thermal energy in the wire, and (c) dissipated as thermal energy in the battery? (a) Number (b) Number (c) Number Units Units Units

The RC charging circuit in a camera flash unit has a voltage source of 285 V and a capacitance of 131 µF. HINT (a) Find its resistance R (in ohms) if the capacitor charges to 90.0% of its final value in 13.2 s.   Ω (b) Find the average current (in A) delivered to the flash bulb if the capacitor discharges 90.0% of its full charge in 1.14 ms.  A

> Lightbulb A is marked "60.0 W 120 V," and lightbulb B is marked "100 W 120 V." These labels mean that each lightbulb has its respective power delivered to it when it is connected to a constant 120-V source. (a) Find the resistance of each lightbulb. Ω RA RB Ω = (b) During what time interval does 1.20 C pass into lightbulb A? S (c) Is this charge different upon its exit versus its entry into the lightbulb? Yes No Explain. This answer has not been graded yet. (d) In what time interval does 1.40 J pass into lightbulb A? S (e) By what mechanisms does this energy enter and exit the lightbulb? Explain. This answer has not been graded yet. (f) Find the cost of running lightbulb A continuously for 30.0 days, assuming the electric company sells its product at $0.110 per kWh. (

In the figure the ideal batteries have emfs &₁ = 18.8 V, &2 = 9.08 V, and 3 = 5.40 V, and the resistances are each 2.20 2. What are the (a) size and (b) direction (left or right) of current i₁? (c) Does battery 1 supply or absorb energy, and (d) what is its power? (e) Does battery 2 supply or absorb energy, and (f) what is its power? (g) Does battery 3 supply or absorb energy, and (h) what is its power? #H (a) Number i (b) (c) 1 & 3. (d) Number (e) (g) left i (f) Number i supply [ supply (h) Number i Units #1&₂ A Units W Units W Units W