A flashlight uses batteries that add up to 1.5 V and has a power output of 0.53 W. (a) How much current is drawn from the batteries? A (b) What is the effective resistance of the flashlight? Ω

A 12.0 V emf automobile battery has a terminal voltage of 16.8 V when being charged by a current of 11.0 A. (a) What is the battery's internal resistance (in N)? 0.4364 (b) What power (in W) is dissipated inside the battery? 52.8 W (c) At what rate (in °C/min) will its temperature increase if its mass is 20.0 kg and it has a specific heat of 0.380 kcal/(kg · °C), assuming no heat escapes? 0.99723 °C/min

In the figure the ideal batteries have emfs ε1 = 18.2 V, ε2 = 9.68 V, and ε3 = 4.90 V, and the resistances are each 2.00 Ω. What are the (a) size current i1?  (f) what is battery 2's power? (h) what is battery 3's power?

Two 1.50-V batteries-with their positive terminals in the same direction-are inserted in series into the barrel of a flashlight. One battery has an internal resistance of 0.230 , the other an internal resistance of 0.130 . When the switch is closed, a current of 600 mA occurs in the lamp. (a) What is the bulb's resistance? Ω (b) What fraction of the chemical energy transformed appears as internal energy in the batteries? %

Two 1.50-V batteries-with their positive terminals in the same direction-are inserted in series into the barrel of a flashlight. One battery has an internal resistance of 0.330 , the other an internal resistance of 0.190 2. When the switch is closed, a current of 600 mA occurs in the lamp. (a) What is the bulb's resistance? 2 (b) What fraction of the chemical energy transformed appears as internal energy in the batteries? % Need Help? Read It

If one wants to design a 1500 W electrical heater that consists of a resistor R with V = 208 V across it, what value should be chosen for R?

A typical cellular phone consumes an average of about 1.32 W of electrical power and operates on 3.80 V. HINT (a) What average current (in A) does the phone draw from its battery? A (b) Calculate the energy (in J) stored in a fully charged battery if the phone requires charging after 9.03 hours of use. J

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

A flashlight uses batteries that add up to 1.5 V and has a power output of 0.42 W. (a) How much current is drawn from the batteries? A(b) What is the effective resistance of the flashlight? Ω