A resistor with resistance 31.5 Q is connected to the terminals of a voltage source. (a) Calculate the current through the resistor when the voltage is set at 7.00 V. A (b) Calculate the power dissipated by the resistor when the voltage is set at 7.00 V. W (c) If the voltage is doubled, recalculate the power. W

A circuit contains a D-cell battery, a switch, a 20- resistor, and three 20-mF capacitors. The capacitors are connected in parallel, and the parallel connection of capacitors are connected in series with the switch, the resistor and the battery, (a) What is die equivalent capacitance of the circuit? (b) What is the KC time constant? (c) How long before the current decreases to 50% of the initial value once the switch is closed?

(a) What is the terminal voltage of a large 1.54-V carbon-zinc dry cell used in a physics lab to supply 2.00 A to a circuit if the cell’s internal resistance is 0.100 ? (b) How much electrical power does the cell produce? (c) What power goes to its load?

A 20.00-V battery is used to supply current to a 10-k resistor. Assume the voltage drop across any wires used for connections is negligible, (a) What is the current through the resistor? (b) What is the power dissipated by the resistor? (c) What is the power input from the battery; assuming all the electrical power is dissipated by the resistor? (d) What happens to the energy dissipated by the resistor?

(a) A defibrillator sends a 6.00-A current through the chest of a patient by applying a 10,000-V potential as in the figure below. What is the resistance of the path? (b) The defibrillator paddles make contact with the patient through a conducting gel that greatly reduces the path resistance. Discuss the difficulties that would ensue if a larger voltage were used to produce the same current through the patient, but with the path having perhaps 50 times the resistance. (Hint: The current must be about the same, so a higher voltage would imply greater power. Use this equation for power: P=I2 RP = .)

A flashing lamp in a Christmas earring is based on an RC discharge of a capacitor through its resistance. The effective duration of the flash is 0.250 s, during which it produces an average 0.500 W from an average 3.00 V. (a) What energy does it dissipate? (b) How much charge moves through the lamp? (c) Find the capacitance, (d) What is the resistance of the lamp? (Since average values are given for some quantities, the shape of the pulse profile is not needed.)

The duration of a photographic flash is related to an RC time constant, which is 0.100F for a certain camera, (a) If the resistance of the flash lamp is 0.0400 duringdischarge, what is the size of the capacitor supplying its energy? (b) What is the time constant for charging the capacitor, if the charging resistance is 800 k ?

A resistor with resistance 25.5 Q is connected to the terminals of a voltage source. (a) Calculate the current through the resistor when the voltage is set at 7.50 V. (b) Calculate the power dissipated by the resistor when the voltage is set at 7.50 V. w (c) If the voltage is doubled, recalculate the power. W

A 30.0 µF capacitor initially charged to 30.0 µC is discharged through a 2.70 k2 resistor. How long does it take to reduce the capacitor's charge to 15.0 µC ? Express your answer with the appropriate units. HẢ ? Value Units

Given the equation, V =Vne RC. of resistor would be required to drop the voltage on a 250µF capacitor to its original voltage in 2 min.? Select one: a. R= 470 k b. R= 450 k R = 460 k2 O c. O d. R= 440k2