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- A circuit contains a D cell battery, a switch, a 20- resistor, and four 20-mF capacitors connected in series, (a) What is the equivalent capacitance of the circuit? (b) What is the fiC time constant? (c) How long before the current decreases to 50% of the initial value once the switch is closed?(a) What is the potential difference going from point a to point b in Figure 21.47? (b) What is the potential difference going from c to b? (c) From e to g? (d) From e to d?If you wish to take a picture of a bullet traveling at 500 m/s, then a very brief flash of light produced by an EC discharge through a flash tube can limit blurring. Assuming 1.00 mm of motion during one EC constant is acceptable, and given that the flash is driven by a 600F capacitor, what is the resistance in the flash tube?
- What would be the maximum cost of a CFL such that the total cost (investment plus operating) would be the same for both CFL and incandescent 60-W bulbs? Assume the cost of the incandescent bulb is 25 cents and that electricity costs 10 cents/kWh, Calculate the cost for 1000 hours, as in the cost effectiveness of CFL example.(a) F ind the voltage drop in an extension cord having a 0.0600-O resistance and through which 5.00 A is flowing. (b) A cheaper cord utilizes thinner wire and has a resistance of 0.300 O. What is the voltage drop in it when 5.00 A flows? (c) Why is the voltage to whatever appliance is being used reduced by this amount? What is the effect on the appliance?Figure 21.55 shows how a bleeder resistor is used to discharge a capacitor after an electronic device is shut off allowing a person to work on the electronics with less risk of shock, (a) What is the time constant? (b) How long will it take to reduce the voltage on the capacitor to 0.250% (5% of 5%) of its full value once discharge begins? (c) If the capacitor is charged to a voltage V0through a 100-O resistance, calculate the time it takes to rise to 0.865V0(This is about two time constants.)
- R1 R2 (ampere) R3 V(volts) For the Voltage-Current graph shown, R3>R2>R1. Select one: O True O False ere to search 近6. For the RC circuit shown, determine the charge on the plates of the capacitor after 40 x 10-3seconds, if R = 20 2, C=1x 10-3F, and e = 3000 volts. Assume the capacitor is charging. C 1.92 b. 2,59 c. 2.74 d. 2.81 none of the above a. e.ليا O₂. C O b. 4C OC. EC Od. EC Oe. EC www.t 3R с ww E The circuit in the figure has been on for a long time. What is the charge on the capacitor? Hint: C behaves like open circuit when it is "fully charged". SR
- -j42= I/0° A 50 For the circuit shown, if I = 30, the reactive power generated by -j4 capacitor in VAR is; OA. 1323.53 B. 661.76 C. 1588.24 D. 1058.82 E. 2647.06Which of the following is the energy consumed by a 16 Ω lightbulb when it is wired to a 12 V battery for 25 seconds? a. 225 b. 270 c. 240 d. 180G ㅇ r1 1 Ohm 15 I www F6 V1 미마 -- A 2002 load receives power from parallel-connected battery cells, as shown in the figure below. Determine the terminal voltage of the parallel- connected battery cells. r2 1 Ohm R_LOAD 20 Ohms V2 B 30℃ Rain sho... ㅁㅁ ②.ENG (7- ENG 10:20 a End Home Insert PrtScr 12V 믐 F7 g 12 V F8 F9 W * F10 F11 F12 "