A flashlight uses batteries that add up to 4.5 V and has a power output of 0.55 W. (a) How much current is drawn from the batteries?   (b) What is the effective resistance of the flashlight?

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

A typical cellular phone consumes an average of about 1.26 W of electrical power and operates on 3.80 V. HINT (a) What average current (in A) does the phone draw from its battery? (b) Calculate the energy (in J) stored in a fully charged battery if the phone requires charging after 6.43 hours of use.

A heart defibrillator passes 12 A of current through a patient's torso for 3×10-3 s to restore normal beating of the heart. (a) How much charge passed through the patient's body? (b) What voltage was used if a total energy of 300 J was dissipated by the current? (c) Estimate the resistance of the electrical path through the person. State any assumptions made in answering this question.

A battery can provide a current of 4.40 A at 2.00 V for 5.00 hr. How much energy (in kJ) is produced?

Thermal energy is to be generated in a 0.133 Oresistor at the rate of 10.5 W by connecting the resistor to a battery whose emf is 1.5 V. (a) What potential difference must exist across the resistor? (b) What must be the internal resistance of the battery? (a) Number i 8.85 Units (b) Number i 0.11 Units