26.14 • Compute the equivalent resistance of the network in Fig. E26.14, and find the current in each resistor. The battery has negligible internal resistance.
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- You charge an initially uncharged 72.1 mF capacitor through a 32.5 Ohm resistor by means of a 9.00 V battery having negligible internal resistance. Find the tim constant of the circuit, the charge on the capacitor t = 1.07T after the circuit is closed, and the charge after time has passed.(a) What is the resistance of a 315 Ω, a 2.50 kΩ, and a 4.00 kΩ resistor connected in series? Ω(b) What is the resistance if they are connected in parallel? ΩA triangular array of resistors is shown in Fig. E26.5. What current will this array draw from a 35.0-V battery having negligible internal resistance if we connect it across (a) ab; (b) bc; (c) ac? (d) If the battery has an internal resistance of 3.00 Ω, what current will the array draw if the battery is connected across bc?
- 26.44 A 12.4-µF capacitor is connected through a 0.895-MN resistor to a constant potential difference of 60.0 V. (a) Compute the charge on the capacitor at the following times after the con- nections are made: 0, 5.0 s, 10.0 s, 20.0 s, and 100.0 s. (b) Compute the charging currents at the same instants. (c) Graph the results of parts (a) and (b) fort between 0 and 20 s.Consider the circuit shown in the figure below. (Assume R, = 10.5 N and R2 = 4.00.) 25.0 V |R2 R2 R E20.0 N a (a) Find the potential difference between points a and b. V (b) Find the current in the 20.0-0 resistor. АThe capacitor in the flash of a disposable camera has a value of 175 μF. 1) What is the resistance of the filament in the bulb if it takes 10 s to charge the capacitor to 80% of its maximum charge? (Express your answer to two significant figures.) ΚΩ
- You charge an initially uncharged 69.1 mF capacitor through a 24.9 2 resistor by means of a 9.00 V battery having negligible internal resistance. Find the time constant t of the circuit. What is the charge Q on the capacitor 1.25 time constants after the circuit is closed? What is the charge Qo after a long amount of time has passed? C QoIf you wish to take a picture of a bullet traveling at 505 m/s, then a very brief flash of light produced by an RC discharge through a flash tube can limit blurring. Assuming 1.00 mm of motion during one RC constant is acceptable, and given that the flash is driven by a 610 µF capacitor, what is the resistance (in Q) in the flash tube? ΩI need help on problem 33)Consider the resistor described in problem 1 carrying a current of 1 mA. If the voltage drop across the resistor is 25:0 Volts, what is the resistance (in k )? (b) Electrical currents crossing the human body in excess of 0.3A are typically deadly. If electrical current has a direct pathway to the heart, it can interfere with your heart beat. In such a case, it only takes about 1 mA to be deadly. Fortunately, under dry conditions, the hand-to-hand resistance of the human body can be as large as 100,000 : This is primarily due to the resistance of your skin. Unfortunately, if your skin is wet or chapped, your resistance can be as low as 1000 . If you touch a 9 Volt transistor radio battery, placing one hand on the positive electrode, and the other hand on the negative electrode, what will be the current passing through your body with dry skin? With wet skin?
- A rectangular resistor is connected with 12 V battery. The resistivity p is 10 •m. What is the power of this resistor when the circuit is running?a) A battery delivers a current of 2 A when connected to two 8.0 2 resistors in parallel. When one or the two resistors is removed, the current decreases to 1.2 A. Use this information to calculate: i) The internal resistance of the battery. ii) The electromotive force of the battery.A 40.0-W lightbulb is connected to a 110.0-V source. (a) What is the current through the bulb? A(b) What is the internal resistance of the bulb? Ω