Electrical Engineering

Eight holiday lights are connected in parallel as shown in Fig.
3. a. If the set is connected to a 120 V source, what is the current through each bulb if each bulb has an internal resistance of 1.8 k?
4. b. Determine the total resistance of the network.
5. c. Find the current drain from the supply.
6. d. What is the power delivered to each bulb?
7. e. Using the results of part (d), what is the power delivered by the source?
8. f. If one bulb burns out (that is, the filament opens up), what is the effect on the remaining bulbs? What is the effect on the source current? Why?

  1. 👍
  2. 👎
  3. 👁
  1. if they are in parallel the same 120 volts is on each
    i = V/R = 120 volts /(1.8*10^3 Ohms) = 0.0667 amps through each bulb
    total resistance = (1.8*10^3 )/8 = 225 Ohms
    i = V/R = 120/225 = 0.534 amps. (0667*8 works too)
    P = i V = 0.0667 * 120 = 8 watts per bulb
    8*8 = 64 watts
    There is no effect on the other bulbs. That is why they are wired in parallel these days.
    There will be the same current through each so 7/8 of he original total current.

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. physics

    A 30 ohm resistor is connected in parallel with a variable resistance R. The parallel combination is then connected in series with a 6 ohm resistor and connected across a 120 V source. Find the minimum value of R if the power

  2. Physics

    Thanks for any help :) Four 20 ohm resistors are connected in parallel and the combination is connected to a 20V emf device. The current is: A) 0.25A B) 1.0 A C) 4.0 A D) 5.0 A E) 100 E Parallel circuits: I know that the voltage

  3. eec115 electrical and electronic engineering science

    two capacitor having capacitance of 10uf and 5uf are connected in series and this combination is connected in parallel with a 20v supplies this parallel combination calculate the charge on each capacitor .the voltage across the

  4. Science

    One light bulb in a string of lights goes out this causes all other lights in string to go out. This is example of A. Resistor B. parallel circuit C. Closed circuit***** D. Series circuit When a switch is turned from the off to

  1. Physics

    Two resistances of 6 ohms and 8 ohms are connected in parallel. This combination is connected in series to another parallel combination of 2 ohms and 5 ohms. If the current in the whole combination is 15 amperes, determine the

  2. science

    three 10 ohm resistors are connected in parallel what is the equivalent resistance of the parallel combination?

  3. physics

    Two resistors, one 12Ohms and the other 18 Ohms, are connected in parallel. What is the equivalent resistance of the parallel combination?

  4. Science

    Three dry cells are connected first in series and then in parallel. The individual cells have voltages of 1.5 V, 1.8 V, and 2.0 V. Calculate the total voltage of the cells when they are connected in series and then when they are

  1. Physic

    Two resistors when connected in series to a 120-V line use one-fourth the power that is used when they are connected in parallel. If one resistor is 4.8 kohms. what is the resistance of the other?

  2. Physics

    A point charge (m = 1.0 g) at the end of an insulating string of length L = 51 cm (Fig. 16-66) is observed to be in equilibrium in a uniform horizontal electric field of E = 9200 N/C, when the pendulum's position is as shown in

  3. math

    The number of streetlights in a town is growing linearly. Four months ago (n = 0) there were 130 lights. Now (n = 4) there are 146 lights. If this trend continues, a. Find an explicit formula for the number of lights in month n b.

  4. Physics.

    A 15.0- resistor and a 20.0- resistor are connected in parallel. A 5.00- resistor is connected in series with this parallel arrangement. The resistors are connected across a 1.00 10^2-V battery. What is the current flowing through

You can view more similar questions or ask a new question.